Sale 1:

https://backpack.tf/profiles/76561198136271423#!/compare/1534291200/1534636800

https://backpack.tf/profiles/76561198024925599#!/compare/1534550400/1534636800

Sold with 9 keys for Duped Miami Yellow Belt

Base on Yellow Belt buyers, would end up high?

https://backpack.tf/profiles/76561198136271423#!/compare/1534809600/1534982400

Only dupe sale to be usable points towards 35 keys, so, high.

Sale 2:

https://backpack.tf/profiles/76561197993400606#!/compare/1523750400/1533859200

SCM

Sale 3:

https://backpack.tf/profiles/76561197993400606#!/compare/1533859200/1536192000

https://backpack.tf/profiles/76561198042694990#!/compare/1534464000/1534636800

SCM

Sale 4:

https://backpack.tf/profiles/76561198042694990#!/compare/1535328000/1535414400

https://backpack.tf/profiles/76561198119634686#!/compare/1535328000/1535414400

Sold for 21 keys + 13 ref

Sale 5:

https://backpack.tf/profiles/76561198311498888#!/compare/1532995200/1533168000

https://backpack.tf/profiles/76561198242454324#!/compare/1531353600/1533081600

Sold for 24 keys(ID Match)

Sale 6:

https://marketplace.tf/items/30122;5;u62

Sold for 54.9 USD

Keys at 1.88 USD

Total is 29.20 keys

Total sales @:

21, 24, 29 keys

https://i.imgur.com/mkjeUgY.jpg

Unsold at 24 keys

https://backpack.tf/item/2308956324

Buyers up to 20 keys

Considering 21 took a while, only one buyer at 20,

Taking 21 - 24 keys.