Re-suggestion, thanks to Erik for the info!

Sale 1:

https://backpack.tf/profiles/76561198339144454#!/compare/1526601600/1531353600

Bulk.

Sale 2:

https://backpack.tf/profiles/76561198081172172#!/compare/1531353600/1531440000

https://backpack.tf/profiles/76561198096723368#!/compare/1529884800/1531440000

Sold for 10 keys

Sale 3:

https://backpack.tf/profiles/76561198096723368#!/compare/1531440000/1531526400

Untrace.

Sale 4:

https://backpack.tf/profiles/76561198337734785#!/compare/1534636800/1534723200

https://backpack.tf/profiles/76561198302145912#!/compare/1534464000/1534723200

Sold for 10 keys

Sale 5:

https://backpack.tf/profiles/76561198302145912#!/compare/1534464000/1534723200

https://backpack.tf/profiles/76561198826088032#!/compare/1534636800/1534723200

Sold for KaW Metal Drill(14) + 3 keys

http://www.tf2outpost.com/trade/29748561

Total is 11 keys.

Sale 6:

https://backpack.tf/profiles/76561198289262378#!/compare/1534723200/1534809600

Bulk.

Sale 7:

https://backpack.tf/profiles/76561198289262378#!/compare/1534809600/1534896000

https://backpack.tf/profiles/76561198026129220#!/compare/1534809600/1534896000

Bulk.

Sale 8:

https://backpack.tf/profiles/76561198096723368#!/compare/1531440000/1531526400

https://backpack.tf/profiles/76561198249274908#!/compare/1531267200/1531440000

Untrace.

Sale 9:

https://backpack.tf/profiles/76561198249274908#!/compare/1531440000/1531526400

https://backpack.tf/profiles/76561198209647735#!/compare/1531440000/1531526400

Sold for DBD Airdog(17) + ~1 key in sweets

Total is 18 keys

Sale 10:

https://backpack.tf/profiles/76561198209647735#!/compare/1532131200/1532217600

Bulkish.

Sale 11:

https://marketplace.tf/items/417;5;u34

Sold for 17.2 USD

Keys at 1.9 USD

Total is 9.05 keys

Erik's Part:

https://gyazo.com/053670fd62da2d360797e89e791d0fca

Would keep 10 in the range.

https://backpack.tf/item/7011273198

https://backpack.tf/item/7030854194

https://backpack.tf/item/7055872386

3 keys were added along the Bubbling Jeepcap for the KaW Drill.

Total sales @:

9.05, 10, 10, 11, 18 keys

Taking 10 - 11 keys.