Correcting the previous suggestion. Credits to Slaven for all of the proof included, I'm just amending the price itself.

>>>Sales<<<

Sale #1: Sold for 55 keys pure. The sale was not actually for 50. The buyer’s backpack makes it look like it could have been 50, but he had actually bought his last 5 keys to pay for the Brigade through Paypal just before the trade occurred, and traded them before his backpack was scanned again (check his bp.tf trust, EpicPhoenix sold him 5 keys on 2/26).

While the seller can be seen offering it for 50 to another potential buyer in their Outpost ad a couple weeks prior to the sale, their backpack shows that Locke paid the full 55. Sort the seller’s backpack by time after the sale - all 55 keys came from the same trade, and the last 5 show EpicPhoenix as the prior owner.

http://www.tf2outpost.com/trade/27781354

https://backpack.tf/profiles/76561198208342268?time=1456473600 – Seller’s backpack before

https://backpack.tf/profiles/76561198208342268?time=1456560000 – Seller’s backpack after

https://backpack.tf/profiles/76561198208342268/#!/compare/1456473600/1456560000 - Seller compare link

https://backpack.tf/profiles/76561198087908177/#!/compare/1456300800/1456646400 - Buyer compare link

>>>Currently on Outpost<<<

http://www.tf2outpost.com/trade/27942585 - No B/O, 2 weeks

If you have any constructive criticisms for my suggestion, leave a comment!