STAR TREK: ENT “T’POL JUMPSUIT” As the costume has the name tag, it is actually from "These are the voyages". T'Pol wears it in the scene where she is packing Trip's things in his quarters after his death, for example.STAR TREK: VOY “CAPTAIN JANEWAY CIVILIAN COSTUME” Another civilian outfit from "Resolutions", the last one she wears in that episode.
STAR TREK: VOY “THE DOCTOR OFF DUTY COSTUME LOT” The blue pajamas were not worn by the Doctor but by Lewis Zimmerman in "Life line".
STAR TREK: ENT "KANTAREAN ENERGY CARBINE" FROM "OASIS" Repainted Andorian Pistols.
STAR TREK: VOY “HARRY KIM OFF DUTY COSTUME LOT” Features pieces from several different costumes. The tank top and red shorts are from "The Q and the grey", for example. The green shorts are seen in "Non sequitur" when Harry wakes up next to his girlfriend Libby. The corresponding green shirt seems to be lost.
STAR TREK: VOY “LIEUTENANT COMMANDER TUVOK OFF DUTY COSTUME”
Seen, for example, in "Remember" and "Mortal coil".
STAR TREK: VOY “LIEUTENANT TORRES OFF DUTY COSTUME”
Torres' pajamas, seen in "Remember".
STAR TREK: VOY “NEELIX COSTUME LOT”
Neelix' pyjamas, seen in "Night".
STAR TREK: ENT “VULCAN CAPTAIN CHAIR” FROM “FALLEN HERO”
First seen in "Breaking the ice".
STAR TREK: VOY “HARRY KIM CIVILIAN COSTUME”
Seen in "Remember" and "Mortal coil".
Chekov's "Lost in the Woods" Costume
Simply not correct
Now here's the jacket that Chekov wore in ST:V The Final Frontier: 
The jacket collar gives it away. (Thanks to Jeff for this)
STAR TREK: ENT “T’POL’S COURTYARD VULCAN STANDS”
Reused dozens of times. Seen as Klingon torches in "Broken Bow", "Judgment" and "Day of honor". seen as Vulcan torches in "Gambit II", "Gravity" and "Home". Also seen in "The Seventh" on Pernaia and in "Heroes and demons" in the Beowulf holodeck program.
STAR TREK: VOY “NEELIX COSTUME”
Worn again by Neelix in "Resistance" when undercover on the Alsaurian homeworld. One of the images of the listing (the blue costume) is of Tuvok's civilian outfit.
STAR TREK ENTERPRISE: LANTERN
Not one single lamp of this type was used in "Starnge new world", another type of lamps was seen in that episode and "Rogue planet". The lamp shown here was originally created for Voyager and seen in "The haunting of deck twelve". As that lamp shows Enterprise-era signage here, it was later modified for use in Enterprise, but definitely not for "Strange new world".
STAR TREK: VOY “LIEUTENANT TOM PARIS ROBE”
Worn by Tom Paris in "Endgame" when he takes pregnant B'Elanna to sickbay, in the middle of the night, early in the episode.
STAR TREK I: “ORBITAL OFFICE COMPLEX MODEL COMPONENT”
This hangar deck model was created for "A time to stand". The close-ups reveal that it was partly created from Maquis Raider and Runabout model parts. This also makes it clear, that it was never created for Star Trek I or II, as those model kits were not available back in 1979 or 1982.... This is the hangar bay of Starbase 375, seen in several DS9 Dominion war arc episodes.
STAR TREK: ENT “KLINGON ELECTRONIC DEVICE”
This is actually a Bajoran tricorder, as seen in such episodes as "Indiscretion" and "Return to grace".
STAR TREK: ENT “XINDI-INSECTOID CONSOLE”
A Xindi Insectoid console from the crash-landed Xindi Insectoid ship in "Hatchery".
STAR TREK: ENT “DEGRA’S SHIP CONSOLE” – LARGE and STAR TREK: ENT “DEGRA’S SHIP CONSOLE”
Those two consoles are not from Degra's ship, seen in several Season 3 episode, but from Degraa's shuttlecraft, only seen in one scene in "The council".
STAR TREK: VOY “LIEUTENANT TORRES CIVILIAN COSTUME”
Worn by B'Elanna during bat'leth practice with Tom Paris in "Displaced".
STAR TREK: VOY “FORMER BORG ICHEB COSTUME LOT” These three costumes basically comprise everything Icheb ever wore in his various episodes, so this is pretty much a complete set of all Icheb costumes (except for the Borg costume, I guess).
STAR TREK: ENT “ORNATE VULCAN ROBE” This robe was only briefly seen in "The Forge", It was worn by a Vulcan present during the bombing in the Earth Embassy at the beginning of the episode. It was featured much more heavily in the following two episodes, "Awakening" and "Kir'Shara" as it was worn by one of the five members of the Vulcan High Command. Here are some shots of the costume:
STAR TREK: ENT “CAPTAIN ARCHER DESERT UNIFORM” FROM “DESERT CROSSING” This costume is special on several levels: The desert uniform was only seen in a few episodes: worn by Archer and Trip in "Desert crossing", by Mayweather, Tucker and Trip in "The breach" and by Archer in "The Forge", "Awakening" and "Kir'Shara". Thus, only 4 people were seen wearing the uniform. The jacket that is sold with the costume here wasn't created, to supplement the desert uniform, until "The Forge", meaning the It's a wrap! description is partially incorrect as the jacket didn't exist at the time of "Desert crossing". Archer is seen wearing the jacket on Vulcan in "The Forge", it disappears after the first episode of the Vulcan three-parter and is not seen in "Awakening" or "Kir'Shara". As Archer is the only person ever seen wearing the jacket, only one jacket like this exists. Well, two: Christie's sold the same complete Archer desert outfit, including the jacket and the NX-01 hat he is seen wearing in the episode, last year. This was the set worn by Scott Bakula. It's a wrap! is currently selling the same set of costumes, only they were worn by Bakula's stunt doubles. Even if the name tag indicates "Scott Bakula" it doesn't have to mean he actually wore the outfit, especially if it is then followed by another name "Vince Deadrick", for example. This basically only means it is the costume of Bakula's stunt double - Deadrick. Anyway, this is still a very cool costume and a two-of-a-kind, so to speak. Hope this little research helps whoever turns out winning the lot!
STAR TREK: VOYAGER “U.S.S. RELATIVITY” STARFLEET UNIFORM – FEMALE WITH CAPTAIN RANK PIPS
Worn by one of the two female officers seen here.
STAR TREK: ENTERPRISE STARFLEET “FIELD RATE 2” PADD
PADDs like that were seen in "First flight". Another similar PADD was sold some time ago (here). That one was clearly seen in the episodes. I went through "First flight" but didn't find this PADD, maybe it was seen just in the background. Those PADDS originally were seen as Vulcan PADDS in "Stigma" until the were modified into Starfleet PADDS for "First flight".
STAR TREK: ENT "ANDORIAN BANNER"
These are intersting. They were created for "Proving ground" for the bridge and ready room of Shran's ship. They were put behind semi-translucent molds, so only parts of the actual pattern were seen on screen. These "banners" give us a clear look at the actual design behind the opaque structures. Here's a screenshot, you can make out the identic pattern behind the frosted mold.
STAR TREK: ENT “AENAR COSTUME” FROM “THE AENAR” - FEMALE
Only two female Aenar were ever seen, Jhamel and Lissan. Jhamel (Shran's future wife and mother of Talla) was the only female Aenar seen with the complete outfit, not just the "indoor" outfit but also the fur and gauze outdoor overcoat. Comparing the fur patterns it becomes clear, that this is actually Jhamel's complete one of a kind costume.
Thanks to Jorg for putting this together!
Alec