Sale 1: (outlier, quicksell)

Sold with an Australium Axtinguisher for an Orbiting Fire Anger plus 6 keys and 18 ref (keys were 19 ref)

(25*0.9) + 6.9 - 8 = 21.4 rounding to 21 keys

http://www.tf2outpost.com/trade/25504813

Seller Before: http://backpack.tf/profiles/76561198095437608?time=1427353200

Seller After: http://backpack.tf/profiles/76561198095437608?time=1427439600

Sale 2: (outlier)

Sold for a Steaming Siberian Facehugger

only one sale in that suggestion so treating it like a mini and not applying overpay twice

22 keys

http://www.tf2outpost.com/trade/25785618

Seller Before: http://backpack.tf/profiles/76561198025812356?time=1429772400

Seller After: http://backpack.tf/profiles/76561198025812356?time=1430204400

Sale 3:

Sold for a Gifted Stormy 13th Hour Engineer's Cap ,a Nuts n' Bolts Sole Mate and ~9 keys of sweets

(60*0.8) + (15 + 9)*0.9 = 69.6 capping at 50 keys

http://www.tf2outpost.com/trade/25721703

Seller Before: http://backpack.tf/profiles/76561198025812356?time=1429340400

Seller After: http://backpack.tf/profiles/76561198025812356?time=1429426800

Notes:

Support proof: (involved a scammer)

Sold for a Haunted Phantasm Jr Hot Dogger + 4 keys

(38*0.9) + 2 = 36.2 rounding to 36

No Outpost trade

Buyer Before: http://backpack.tf/profiles/76561198052306405?time=1427785200

Buyer After: http://backpack.tf/profiles/76561198052306405?time=1427871600

http://www.tf2outpost.com/trade/25505523 Offered 5 pure

Mini for the Steaming Siberian Facehugger:

http://backpack.tf/vote/id/553f4d7db98d8844328b4819

Mini for the Engineer Cap:

No recent sales, the most recent one is this:

http://backpack.tf/item/1193158634 -> http://backpack.tf/item/2042457570

Sold for Hellfire Harenkutte, which has a current B/O of 60 on the market.

Conclusion:

A quick sale at 21, a sale at 50 and an outlier at 22, taking the final price at 50 keys.