So I finally went through a box of demos I had, if the title is followed by an "S" it means its sealed in the plastic.
Other than the ones marked "loose", they are all in perfect shape in the cardboard sleeve or other way they came. Many opened demos still have the plastic on them with just a slit to get the disk out.

Does anyone see any that fancy collectors?

EGM 50 new games dvd
EGM Lord of the RIngs 3rd Age w/ Sonic Heroes
EGM RE4, STar Wars KOTOR II

PS2 / DVD/ CD
Ultimate Spiderman Sneak Peek DVD S
Castlvania Curse of Darkness Limited Edition Soundtrack Sampler S
ATV Offroad Fury soundtrack sampler S
ATV Offroad Fury 2 S
True Crime / Gun D/O
Mercenaries S
DDR Revolution Ultramix 2 LE Music Sampler S
DDR Revolution Ultramix 3 LE Music Sampler S
DDR Revolution Extreme 2 LE Music Sampler S
Call of Duty 2 S X2
PS2 Demo Disc EA BIG SSX NFSMW, 007 From Russia..S
Everquest Online Adventures
Midnight Club II Soundtrack Sampler S
XIII Rare Groove and Funk Soundtrack
Arc The Lad Twilight of the Spirits
Drakengard S
Socom II
Alter Echo
Soul Calibur II
Hunter: The Reckoning Wayward. Features 2 exclusive levels and a documentary.
Sphinx And the Shadow of Set
Steamboat Chronicles S
Crash Bandicoot Nitro Kart
.hack mutation Part 2 S
Freaky FLyers
Gladius
Downhill Domination S

Loose:
PSM 104 Tomb Raider
PSM 96 Looks like Mortal Kombat
PSM 99 King Kong I think
PSM 103 Black
PSM 72
PSM 73

Original Call of Duty Soundtrack by Michael Giacchino S
Next Generation 41

Dreamcast
Demolition Racer
XBOX
Outrun 2 #37 in case
Men of Valor #35 in case