Only recent sale I can make sense of

Sold/offered with 3 keys for blizzardy stormy deep cover operator (in date at time of sale - 54-62 keys) = 58 - 3 = 55 keys

Seller before: http://backpack.tf/profiles/76561198001095467?time=1430550000 (May 2nd)

Seller after: http://backpack.tf/profiles/76561198001095467?time=1430636400 (May 3rd)

Compare link: http://backpack.tf/profiles/76561198001095467?time=1430550000&compare=1430636400

All the other trades in this history look like sweetstakes to me, but if anyone else spots a valid one feel free to let me know or counter:

http://backpack.tf/item/3277542478

Feedback welcome.