Credits to Foamy, Mindacos, and FF.eu | FFreezY♥ for at least half of the sales here.

http://backpack.tf/suggestion/5740aaf983de6b200576c03f

http://backpack.tf/profiles/76561198194152546#!/compare/1465084800/1465171200

Stormy Whirly Warrior(38) + 10 keys = ~48

48 keys.

http://backpack.tf/profiles/76561198194152546#!/compare/1464912000/1464998400

Max(~25) + Miami Nights Scotch Bonnet + ~5 keys in items.

Didn't see any usable sales for the Bonnet, using the outdated price = ~53 keys.

http://backpack.tf/profiles/76561198052957918#!/compare/1462665600/1463184000

Scorching Stuntman(45) + 15 keys.

60 keys.

http://backpack.tf/profiles/76561198059607762#!/compare/1460937600/1461024000

43 keys.

http://www.tf2outpost.com/trade/28079037

http://backpack.tf/profiles/76561198019556015#!/compare/1461024000/1461196800

Sort by time on april 21st show that 45 keys were obtained in one trade, matching the buyer

45 keys.

http://backpack.tf/profiles/76561198053763983#!/compare/1459987200/1460419200

Sort by time on 4/12.

43 keys.

Sold for a Duped Searing Plasma Modest Pile of Hat

http://backpack.tf/profiles/76561198059607762/#!/compare/1458950400/1459036800

http://www.tf2outpost.com/trade/27994057

Should easily cap at 55 keys.

Stuntsman mini ~45

http://backpack.tf/profiles/76561198054103836#!/compare/1464998400/1465516800

30 keys + Smoking Nappers(18)

Seller at 45 keys for 1 month

http://www.tf2outpost.com/trade/28126396

Warrior mini ~38

http://backpack.tf/profiles/76561198049166729#!/compare/1462665600/1463616000

DP Braniac(33) + 5 keys.