Sale 1:

https://backpack.tf/profiles/76561197970869719#!/compare/1542326400/1542412800

Bulk

Sale 2:

https://backpack.tf/profiles/76561198021055079#!/compare/1543363200/1543449600

https://backpack.tf/profiles/76561198275322559#!/compare/1543363200/1543449600

Sold for 7 keys

Sale 3:

https://backpack.tf/profiles/76561198059738981#!/compare/1538870400/1539648000

https://backpack.tf/profiles/76561198257977681#!/compare/1540512000/1540598400

SCM

Sold for 21.67 CAD

Keys at 3.13 CAD

Total is 6.92 keys

Sale 4:

https://backpack.tf/profiles/76561198355817251#!/compare/1538611200/1539043200

https://backpack.tf/profiles/76561198132129628#!/compare/1539216000/1539302400

Gift

Sale 5:

https://backpack.tf/profiles/76561198131529791#!/compare/1540598400/1541635200

https://backpack.tf/profiles/76561198199244659#!/compare/1540512000/1540598400

Untrace

Sale 6:

https://backpack.tf/profiles/76561198199244659#!/compare/1540598400/1540684800

https://backpack.tf/profiles/76561198018719204#!/compare/1540598400/1540684800

Untrace

Sale 7:

https://backpack.tf/profiles/76561198018719204#!/compare/1540598400/1540684800

https://backpack.tf/profiles/76561198377177128#!/compare/1540598400/1540684800

Sold for 6 keys

Sale 8:

https://backpack.tf/profiles/76561198377177128#!/compare/1541980800/1542067200

https://backpack.tf/profiles/76561198158554103#!/compare/1542067200/1542153600

Sold in bulk with spells.

Sale 9:

https://backpack.tf/profiles/76561198158554103#!/compare/1542240000/1542326400

Untrace

Sale 10, 11, 12:

https://marketplace.tf/items/30845;5;u3005

Sold for 13.99, 15, 15.99 USD

Keys at 1.84, 1.77, 1.64 USD

Totals are 7.60, 8.47, 9.75 keys

Total sales @:

6, 6.92, 7, 7.60, 8.47, 9.75 keys

Taking 6 - 7 keys.