Sale 1:

https://backpack.tf/profiles/76561198025698470#!/compare/1546214400/1546905600

https://backpack.tf/profiles/76561198273681900#!/compare/1546128000/1546214400

QS?

Sale 2:

https://backpack.tf/profiles/76561198273681900#!/compare/1548720000/1548806400

https://backpack.tf/profiles/76561198057809362#!/compare/1548720000/1548806400

Sold for Spooky Scorcher + ~3 keys in sweets

Scorcher Mini:

https://backpack.tf/suggestion/5c8098f3d381723f300f819a

Suggestion for 17.5 keys

Total is 20.5 keys

https://bot.tf/stats/listings/Y93O0DDY

B/O of 12 keys

Sale 3:

https://backpack.tf/profiles/76561198057809362#!/compare/1549843200/1550275200

https://backpack.tf/profiles/76561198337734785#!/compare/1550016000/1550275200

Sold for 10 keys, QS

Sale 4:

https://backpack.tf/profiles/76561198337734785#!/compare/1550275200/1550361600

https://backpack.tf/profiles/76561198076610032#!/compare/1550275200/1550361600

Sold for 11 keys

Sale 5:

https://backpack.tf/profiles/76561198076610032#!/compare/1550275200/1550361600

https://backpack.tf/profiles/76561198335718650#!/compare/1550275200/1550361600

Sold for Planets Harmburg + 1 key

Harmburg Mini:

https://backpack.tf/suggestion/5c809806678072133c0b1c00

Suggestion for 12 keys

Total is 13 keys

Sale 6:

https://backpack.tf/profiles/76561198068732040#!/compare/1550361600/1550448000

https://backpack.tf/profiles/76561198335718650#!/compare/1550361600/1550448000

Bulk

Sale 7:

https://marketplace.tf/items/47;5;u7

$37.86 / $1.68 = 22.54 keys

https://backpack.tf/item/226422685

https://bot.tf/stats/listings/46NORER4

B/O of 18 keys

Total sales @:

11, 12, 13, 18 keys

Taking 11 - 13 keys