Sale 1:

https://backpack.tf/profiles/76561197993834789#!/compare/1564358400/1564444800

https://backpack.tf/profiles/76561198321125068#!/compare/1559865600/1564704000

SCM

sale 2:

https://backpack.tf/profiles/76561198040490993#!/compare/1567987200/1568246400

https://backpack.tf/profiles/76561198147348741#!/compare/1566086400/1569024000

Untrace

Sale 3:

https://backpack.tf/profiles/76561198081319092#!/compare/1555632000/1565136000

https://backpack.tf/profiles/76561197992953927#!/compare/1565136000/1566000000

SCM

Sale 4:

https://backpack.tf/profiles/76561198260129065#!/compare/1565740800/1566086400

https://backpack.tf/profiles/76561198023051867#!/compare/1566000000/1566172800

SCM

Sale 5:

https://backpack.tf/profiles/76561198333986358#!/compare/1567123200/1567209600

https://backpack.tf/profiles/76561198224648164#!/compare/1567123200/1567209600

Sold for C9 Valley(11.5) + DP Impaler

Impaler Mini:

https://backpack.tf/suggestion/5d9ad64e6780726c1d470582

Suggestion for 11 keys

Total is 22.5 keys

Sale 6:

https://backpack.tf/profiles/76561198224648164#!/compare/1567123200/1567209600

https://backpack.tf/profiles/76561198847955284#!/compare/1567123200/1567209600

Sold with ~2 keys in sweets for Stormy Noble

Noble Mini:

https://backpack.tf/suggestion/5d9b68086780725dfa5b1724

Suggestion for 15 keys

Total is 13 keys

Sale 7:

https://backpack.tf/profiles/76561198847955284#!/compare/1567209600/1567296000

https://backpack.tf/profiles/76561198368964060#!/compare/1567209600/1567296000

Sold for CTFL Snaggle + C9 Goggles

Snaggle Mini:

https://backpack.tf/suggestion/5d9ade8bd38172418b341bf2

Suggestion for 10 keys

Goggles Mini:

https://backpack.tf/suggestion/5d9b66fcd381721b7064c274

Suggestion for ~8 keys

Total is 18 keys

Sale 8:

https://backpack.tf/profiles/76561198368964060#!/compare/1567296000/1567382400

https://backpack.tf/profiles/76561198144120574#!/compare/1567296000/1567382400

Sold for HG Bloke's(23)

Sale 9 - 10:

https://marketplace.tf/items/tf2/30553;5;u56

$20 / $1.84 = 10.87 keys

$26 / $1.82 = 14.29 keys <-- https://backpack.tf/item/7957084430

Total sales @:

10.87, 13, 14.29, 18, 22.5, 23 keys

buyers up to 11 keys,

sellers for 20, 22 keys,

calling 22.5+ high,

calling 10.87 low,

taking 13 - 18 keys.