@muguk: Wow, that's a lot of stuff. I hope you DO get a good price for selling this collection. It must've cost a lot of dedication to collect all of this stuff.
Regarding comparing to the Atarimania database. It's a lot of stuff and not that much time. I can start to compare them to what's online. I hope many others will do so, too. But maybe someone with access to all the resources of the project could check in a more economic manner

. A huge thanks for offering.
Starting to check from the last entry since I figure that most people will do it from the first one

:
Letter Z:
Z-Out is missing everything (pasti,box,manual);
Zynaps (pasti, manual);
Zone Warrior; missing pasti, disksscan, box, manual ------> already preserved by you, not on atarimania; it would be great if you uploaded it on the ftp;
Zork 1-3 by Mastertronic are not pastied (1 and 3 only have *.st dumps; Zork 2 isn't done at all); Manuals and Scans are missing;
Zool is missing everything (pasti, disks, manual, box);
Zany Golf; missing pasti,box, disks, manual
Edit: Wow, from what I've seen so far, a lot of this stuff is rare and missing. Is there any chance to postpone selling it off? Or do you have some time to spare to at least dump some of this stuff before selling them this week (also scanning the boxes/disks would be awesome)? It would save many people countless hours of ebay search.
Maybe someone else over at Aarimania also got some of this stuff in his possession?