Malodorous Keepsake

The Maldorous Keepsake is one of the 130 treasures in Wario: Master of Disguise. It is #8 in the pink catagory in Wario's catalouge, saying that it's "A solid-gold keepsake that reeks of spoiled cheese and wet carpeting. Scientists the world over are baffled as to why this is." Because of that, the retail price is $15917. It can be found in Episode 3.