I went on an unboxing spree today, and opened up a rare item from a robo-crate. I quickfired through all of the keys I had, and upon checking my inventory for this rare, I found that it was missing. I'm not sure if this is a bug, or if anybody else has had this issue before..
I checked my bank, my queue, all through my inventory, and still nothing.
If it helps, here's the item showing up in chat after I unboxed it: http://steamcommunity.com/sharedfiles/filedetails/?id=457363608
And here is my inventory afterwards: http://steamcommunity.com/sharedfiles/filedetails/?id=457363727
Please let me know if there's anything else I can do to further assist in solving this situation.