Resident Evil Mansion Keys by CAPCOM

Super rare promo. In 1996, at the Tokyo Game Show in Japan, Capcom gave out the keys to attendees of the videogame tradeshow (which was open to videogame industry members, press and the public). In subsequent years (at least until 1999), Capcom sold the keys at their Capcom booth on the floor. At the Tokyo Game Show (TGS), most of the major videogame publishers had their own stores on the floor where they sold videogame related merchandise.

Also:

Banjo Kazooie N64 Game Cases – I forget where these etched cases come from. While they don’t tend to sell for much, they’re pretty cool.
Sealed Guild Wars 2 Collector’s Edition CE
Brand New Nintendo Entertainment System Console
Behemoth Castle Crashers Barbarian Vinyl Action Figure
Tangerine Dream Official Atari-Sponsored 1988 U.S. Tour T-Shirt
SDCC Comic HALO 3 Promo UNSC Brown Military Style Carrying Bag – From 2007.
Tomb Raider Lara Croft Rare Perfume – I can’t imagine anything associated with Raiding Tombs would actually smell good.
The Legend of Zelda: Ocarina of Time Promotional Duffle Bag
Vintage Mead Trapper Keeper SEGA Sonic The Hedgehog Notebook – Is it wrong for an adult man to want this?
Sonic the Hedgehog Original Retailer Genesis Poster Sign
Mega Man Universe Inflatable Arthur Lance – From NYC 2010. The game itself went on to become cancelled.
SNES Super Famicom Box with Original Keys and Instructions
NES TMNT Palcom Hardware Bundle

Ended:

Pathway to Glory N-Gage Special Edition Press Kit – Nokia’s debut first-party N-Gage title. Game, case, mini prints and soundtrack.
Assassins Creed San Diego Comic Convention 2007 Pewter Medallion