And you thought I just collected costumes! This is Grand Nagus Zek's Hupyrian beetle snuff box. Often mentioned throughout the series, but seen twice in the series. 
We first see this in the season 2 episode 'Rules Of Acquisition'.
...and finally in the season 6 episode 'Profit And Lace'.
This Ferengi beetle snuff box was originally sold at the 2006 Christie's auction and had traded hands a couple of times when the last owner had contacted me about buying it from him. It now resides with it's true owner, Zek, in my collection.
