For Mindacos.

http://backpack.tf/item/2345337664

Sale 1) Sold for an Orbiting Fire Mann of Reason + Miami Nights Bolted Birdcage (10 Keys)

http://backpack.tf/profiles/76561198019556015#!/compare/1486598400/1486684800

No decent Mini on the Mann.

http://backpack.tf/item/2766900892

Sale 2) Sold + 1 Key for a Purple Confetti Pampered Pyro (24 Keys)

http://backpack.tf/profiles/76561198119629032#!/compare/1483401600/1483488000 - Seller's Backpack

http://backpack.tf/profiles/76561198150669590#!/compare/1483401600/1483488000 - Buyer's Backpack

24 - 1 = 23 Keys

Pyro Mini

http://backpack.tf/profiles/76561198055224435#!/compare/1483401600/1483488000 - Sold + 3 Keys + ~1 Key of Items for a Smoking Bonk Boy

~24 Keys

Sale 3) Sold + 4 Keys for a Disco Beat Down Professional's Panama (28 Keys)

http://backpack.tf/profiles/76561198150669590#!/compare/1483488000/1483574400

28 - 4 = 24 Keys

Panama Mini

http://backpack.tf/profiles/76561198053700606#!/compare/1489017600/1489104000 - Sold for a Ghosts Trilby (27.5 Keys) + Starduster (2.4 Keys)

http://www.tf2outpost.com/trade/28822251 - Capped by the Buyout of 28 Keys

Sale 4) Sold for a Searing Plasma Doctor's Sack

http://backpack.tf/profiles/76561198149631517#!/compare/1485648000/1485734400

No sack mini.

http://imgur.com/a/ZHr94 - Sellers at 20 Keys