What's a picture of the Sonic 2 cardridge doing here at hygene?
That's because...surprise...it's a soap!
This cartridge looking item is actually a solid block of black soap molded into an exact cartridge shape. It's been given a sticker of the Sonic 2 game, and comes in a box that looks just like (almost) the old game's plastic box. The company "Digital Soap" produces really authentic looking replicas of items that are made of soap. This is available at Hot Topic in 2017.
NOTE: You CANT USE the soap! Well...you can....but not if you want to collect it.

The sticker will no-doubt come right off if you wet the soap for use, so this is best preserved in a collection alongside its box. Does it smell nice? You can write in for credit if you know. This is an interesting idea.