Sale 1:

Sold for a a Bubbling Tyrant's Helm + 2 keys + 0.5 sweets

25.5 + 2 = 27 capping at 24 keys

http://www.tf2outpost.com/trade/26060448

http://backpack.tf/profiles/76561198044384183?time=1432796400

http://backpack.tf/profiles/76561198044384183?time=1432882800

Sale 2:

Sold for a Miami Nights Respectless Rubber Glove

20 keys

No outpost trade

http://backpack.tf/profiles/76561197970682735?time=1437462000

http://backpack.tf/profiles/76561197970682735?time=1437548400

Notes:

Mini for the Miami Nights Respectless Rubber Glove: ~20

Sold with 2 keys of sweets + 3 keys for an Orbiting Planets Tough Stuff Muffs

(28*0.9) - 3 - 2 = 20.2 rounding to 20 keys

http://backpack.tf/profiles/76561198037505141?time=1438153200

http://backpack.tf/profiles/76561198037505141?time=1438326000

Supporting seller at 20: http://www.tf2outpost.com/trade/26796325

Mini for the Tyrant: ~25

Sold for a Nuts n' Bolts Otolaryngologist's Mirror + Orbiting Fire Ze Goggles + Spec. S.F. Shotgun

(11.5 + 4.5 + 12)*0.9 = 25.2 rounding to 25 keys

http://www.tf2outpost.com/trade/26073664

http://backpack.tf/profiles/76561198044384183?time=1432969200

http://backpack.tf/profiles/76561198044384183?time=1433228400

Conclusion:

Sales at 20 and 24