As requested.

SALES:

http://www.tf2outpost.com/trade/24704180 Sold on Feb 10th for 110.4 Euros on SCM

Keys were going for £1.60 on SCM on Feb 10th, which is 2.2 Euros.

Therefore, Buyer paid (110.4 / 2.2) = 50.2 keys (rounding to 50) (also the B/O)

http://www.tf2outpost.com/trade/20573867 Sold for 4.5 pure

Keys were ~12, = 54

http://www.tf2outpost.com/trade/25614610 Sold in a f*cking heartbeat for 25 keys

Slightly outdated, but supporting proof:

http://www.tf2outpost.com/trade/24385432 Sold for Sulph Nappers (56)

56 * 0.9 = 50.4 (rounding to 50)

Histories;

http://www.tf2outpost.com/item/440,2857721342,105,5

http://www.tf2outpost.com/item/440,3404007545,248,5

Only recent sales. I think.

Let it ride.