Looking through the database, unique ones that I have are:
Puzzled for Neo Geo MVS
Lupin III: Pandora no Isan for Famicom
Moai Kun for Famicom
Spectre VR for Macintosh (I'll bet nobody else has it complete with its weird shaped box)
a number of Mac Classic software actually... nobody here was an old Mac gamer?
Gaming related items that aren't listed that I don't think anyone else has:
The blue metal Flynn's Arcade sign from Disneyland when they had the ElecTRONica event. There were only a few made by the park's prop department from what I understand. The sign sat outside the arcade. It was so much fun, I really miss that event!
Also, I've got one of those black silk advertising banners that Nintendo would send to stores like Toys R Us in the '90s to drive us kids crazy about video games. Mine has the Zelda Link to the Past logo, with "IS HERE!!" written in big letters.