Many prototypes! And really rare videogaming stuff today!

Protos go first!

SUPER NES BATTLE CLASH proto (no EPROMs inside afaik)
SUPER NES ZOMBIES ATE MY NEIGHBORS proto
SUPER NES HYPER V-BALL proto

Most likely final versions.

Ultima: Runes of Virtue GB proto

MAGNAVOX ODYSSEY MUNCHKIN proto

Atari 5200 System w/case & games from Atari worker

These looks to me just like standard production PCBs without cases.

And now DEV stuff!

Sega HKT-01 Dreamcast Development Dev kit

Panasonic 3DO FZ-10 Testing Station

Panasonic 3DO FZ-1 Testing Station

Xbox Beta Bag, given to beta testers

Not really DEV related, but quite cool!

Misc items:

CD-I disc version 1 september 1994 Demo

Nintendo Legend of Zelda Link Bobble Head

1981 Mattel Intellivision dealer catalog
With keyboard!

Oh, and check this video on how NOT to promote a shredding machines to a public who loves classic gaming!