Sale 1:

http://www.tf2outpost.com/trade/25321346

Sold for entire bp - total 1495 refined / 17.33 (key price at time of sale) = 86 * 0.9 = 77.4 = 77 keys

Sellers bp before: http://backpack.tf/profiles/76561198081967527?time=1426402800

Sellers bp after: http://backpack.tf/profiles/76561198081967527?time=1426489200

Buyers bp before: http://backpack.tf/profiles/76561198048123031?time=1426230000

Buyers bp after: http://backpack.tf/profiles/76561198048123031?time=1426489200

Sale 2

Sold for 55 keys pure (seems like an outlier, see why below)

http://i.imgur.com/yFn6Q2C.jpg

Based on the offers these are getting, 55 keys seems like an outlier. Notable offers:

http://www.tf2outpost.com/trade/25587284

Aces KE (96-104 keys, though outdated) 100 x 0.9 = 90 keys

Chicoptera Venata Familiar Fez (78-84 keys, though outdated) + aussie ambassador (15-16 keys) x 0.9 = ~87 keys

Phosphorous backwards ballcap (~90 keys) x 0.9 = 81

67 keys + 19 ref + Strange Festive Huntsman (6-6.8 keys) x 0.9 = ~74.8 keys

etc

Any other proof or feedback would be appreciated. :)