Resuggestion, thank to Randy for the correction!

Sale 1:

https://backpack.tf/profiles/76561198086506369#!/compare/1526774400/1542758400

https://backpack.tf/profiles/76561198048074332#!/compare/1535760000/1537574400

Untrace

Sale 2:

https://backpack.tf/profiles/76561198438469586#!/compare/1535328000/1535414400

https://backpack.tf/profiles/76561198024867201#!/compare/1535328000/1535414400

Keys?

Sale 3:

https://backpack.tf/profiles/76561198024867201#!/compare/1538697600/1538784000

https://backpack.tf/profiles/76561198107219183#!/compare/1538697600/1538784000

Sold for 20 keys (Creds to zangy in previous suggestion)

Sale 4:

https://backpack.tf/profiles/76561198107219183#!/compare/1538956800/1539129600

https://backpack.tf/profiles/76561198375042345#!/compare/1539129600/1539216000

Sold with negligible sweets for KaW Inspecteur + ~3 keys in sweets

Sale 5:

https://backpack.tf/profiles/76561198375042345#!/compare/1539302400/1539475200

https://backpack.tf/profiles/76561198278228607#!/compare/1539043200/1539475200

Sold for DP Slo-Poke + 2 keys in sweets

Use there.

Sale 6:

https://backpack.tf/profiles/76561198278228607#!/compare/1539475200/1539907200

Sold with 1 key for Bubbling Kabuto

Use there.

Sale 7:

https://backpack.tf/profiles/76561198124723591#!/compare/1539734400/1539820800

QS for 11 keys

Sale 8:

https://backpack.tf/profiles/76561198337734785#!/compare/1542153600/1542240000

https://backpack.tf/profiles/76561198227232564#!/compare/1542153600/1542240000

Sold for 16 keys

Total sales @:

16, 20 keys

Taking 16 - 20 keys