All credits to k1ng and elipoplefish, literally just Ctrl C+ Ctrl V'd this.

Sale 1

https://backpack.tf/profiles/76561198188251237#!/compare/1504137600/1504224000

Sold for a Blizzardy Storm Company Man, Orbiting Fire Master's Yellow Belt and 6 keys pure

Mini for Yellow Belt: https://marketplace.tf/items/110;5;u33

Most recently sold for $60

60/2 is 30 keys

25+30+6=61

Sale 2

https://backpack.tf/profiles/76561198173027559#!/compare/1503705600/1503792000

Sold for Miami Nights Tough Stuff Muffs and 2 keys in sweets

54+2 is 56

Sale 3

https://backpack.tf/profiles/76561198276944705#!/compare/1501977600/1502236800

Sold for Frostbite Harmburg

55

Sale 4

https://backpack.tf/profiles/76561198074120641#!/compare/1502409600/1502496000

Sold for a Purple Confetti Salty Dog and 2 key in sweets

60+2 is 62

Capping at B/O of 55: http://www.tf2outpost.com/trade/29319951

~54 in unusuals

https://backpack.tf/profiles/76561198164622774#!/compare/1505260800/1505433600

Around ~58, but the Bonk is outdated:

https://backpack.tf/profiles/76561198174361109#!/compare/1506038400/1506124800

Orbiting Fire Belt is being updated at 26 keys, so the first sale would be 26 + 26 + 6 = 58 keys total.

https://backpack.tf/suggestion/59bfe9b1cf6c7501927e737f

Sales I'm not using:

https://backpack.tf/profiles/76561198004310955#!/compare/1503532800/1503619200

Unpriced, using for that

https://backpack.tf/profiles/76561198130174796#!/compare/1500249600/1500595200

2 years outdated, using for that

Other sales: Bulk

https://backpack.tf/profiles/76561198067575136#!/compare/1505001600/1505088000

Bulk

https://backpack.tf/profiles/76561198067575136#!/compare/1502755200/1502841600