Choo Choo. Car 53.

Sale 1:

https://backpack.tf/profiles/76561198337734785#!/compare/1536278400/1536364800

https://backpack.tf/profiles/76561198762208053#!/compare/1536192000/1536624000

Untrace.

Sale 2:

https://backpack.tf/profiles/76561198199904598#!/compare/1534377600/1534464000

https://backpack.tf/profiles/76561198056793444#!/compare/1534377600/1534464000

Sold for 32 keys.

Sale 3:

https://backpack.tf/profiles/76561198169337842#!/compare/1535587200/1535673600

https://backpack.tf/profiles/76561198048851745#!/compare/1535587200/1535673600

Bulk.

Sale 4:

https://backpack.tf/profiles/76561198048851745#!/compare/1536364800/1536451200

https://backpack.tf/profiles/76561198172573626#!/compare/1536364800/1536451200

Sold for 35 keys

Sale 5:

https://backpack.tf/profiles/76561198172573626#!/compare/1536451200/1536537600

https://backpack.tf/profiles/76561198275735463#!/compare/1536364800/1536537600

Sold for Stormy KE

KE Mini:

https://backpack.tf/suggestion/5b9d8c4344325a6d9a771c2e

Suggestion for 51.5 keys.

Sale 6:

https://backpack.tf/profiles/76561198275735463#!/compare/1536710400/1536796800

https://backpack.tf/profiles/76561197988619397#!/compare/1536192000/1536969600

Sold with ~9 keys in sweets for Strange Blizzardy Casemaker

Use there

Sale 7:

https://backpack.tf/profiles/76561197988619397#!/compare/1536192000/1536969600

https://backpack.tf/profiles/76561198079821428#!/compare/1536883200/1536969600

Sold for 38 keys

Sale 8:

https://marketplace.tf/items/30743;5;u18

Sold for 80 USD

Keys at 1.88 USD

Total is 42.55 keys

Total sales @:

32, 35, 38, 42.55, 51.55

Buyers up to 32 keys.

Considering 35 took a week to sell,

38 was instant,

42 took a few months,

Let's play conservative, take 38 to 52 keys, prob change if more sales happen.