Instance: https://backpack.tf/item/8271588668

Sale 1:

0 sell https://backpack.tf/profiles/76561198059315454#!/compare/1659312000/1660176000

Untraceable

Instance: https://backpack.tf/item/7555330174

Sale 2:

0 buy https://backpack.tf/profiles/76561198994801324#!/compare/1621209600/1656806400

Untraceable

Instance: https://backpack.tf/item/7471033611

Sale 3:

0 buy https://backpack.tf/profiles/76561198043050130#!/compare/1657065600/1659571200

0 sell https://backpack.tf/profiles/76561198143571220#!/compare/1659571200/1659657600

Sold for 32 keys pure

Sale 4:

1 buy https://backpack.tf/profiles/76561198143571220#!/compare/1657584000/1657929600

1 sell https://backpack.tf/profiles/76561198311498888#!/compare/1657843200/1657929600

Untraceable

Sale 5:

2 buy https://backpack.tf/profiles/76561198311498888#!/compare/1656633600/1656720000

2 sell https://backpack.tf/profiles/76561198283619846#!/compare/1656633600/1656720000

Sold for around 29 keys in mixed

Sale 6:

3 buy https://backpack.tf/profiles/76561198283619846#!/compare/1656201600/1656288000

3 sell https://backpack.tf/profiles/76561198084126218#!/compare/1656201600/1656288000

Sold for 55 keys pure

Marketplace sales:

150$/1.95$ = 77 keys (excluded because looks high considering listed cheaper and unsold instances on backpack at the same time)

Sales: 29,32,55

Buy orders at 43 keys so excluding 29,32 keys and taking 55 keys flat :)