Random hat.

Sale 1

Sold for 18 keys

http://backpack.tf/profiles/76561198042678929#!/compare/1481587200/1482019200

http://www.tf2outpost.com/trade/28602357 ----- No B/O

=======> 18 keys

======================================================

Sale 2

Sold for a Cloud 9 Heavy Duty Rag (18) + Strange SKS Festive Crossbow (~5) + Balloonibouncer (1.45)

http://backpack.tf/profiles/76561198004517334#!/compare/1478131200/1478217600

http://www.tf2outpost.com/trade/28546400 ----- B/O was removed

=======> 18 + 5 + 1.45 = ~24 keys

======================================================

Sale 3

The guy from above resold it for what appears to be 14 keys

http://backpack.tf/profiles/76561197988155310#!/compare/1479340800/1479513600

No Outpost trade

=======> 14 keys

======================================================

Sale 4

No idea. The hat probably went to a private inventory.

http://backpack.tf/profiles/76561197988155310#!/compare/1479600000/1479686400

No Outpost trade

=======> Not using

======================================================

Sellers

- No sellers at the time (the one on Outpost sold already).

Summary

- Sales for 14, 18, 24.

- The sale for 24 keys most likely had a lower B/O, and the guy who bought it apparently resold for 14 keys.

I will go with 18 keys flat. It's the most recent, full pure sale. Criticism appreciated!