Resuggestion, thanks to Randy for the info!

Sale 1:

https://backpack.tf/item/1130372289

Alt move

Sale 2:

https://backpack.tf/profiles/76561198125791160#!/compare/1529884800/1529971200

https://backpack.tf/profiles/76561198092249044#!/compare/1529884800/1529971200

Sold for 8 keys + 17 ref

Sale 3:

https://backpack.tf/profiles/76561198315588518#!/compare/1532044800/1532131200

https://backpack.tf/profiles/76561198337824028#!/compare/1532044800/1532131200

Can only trace 5 keys.

Sale 4:

https://backpack.tf/profiles/76561198337824028#!/compare/1532044800/1532131200

https://backpack.tf/profiles/76561198048851745#!/compare/1532044800/1532131200

Sold for 7 keys + 2 ref

Sale 5:

https://backpack.tf/profiles/76561198048851745#!/compare/1532908800/1532995200

https://backpack.tf/profiles/76561198060724808#!/compare/1532131200/1533081600

Untrace.

Sale 6:

https://backpack.tf/item/4990496925

Can't trace.

Sale 7:

https://backpack.tf/profiles/76561197966672891#!/compare/1529193600/1529280000

https://backpack.tf/profiles/76561198049204840#!/compare/1529193600/1529280000

Sold for 7 keys + 14 ref

Sale 8:

https://backpack.tf/profiles/76561198162384989#!/compare/1532476800/1532563200

https://backpack.tf/profiles/76561198172350763#!/compare/1532476800/1532563200

Sold for 7 keys + ~1 key in sweets

Total is 8 keys

Sale 9:

https://backpack.tf/profiles/76561198172350763#!/compare/1532563200/1532649600

https://backpack.tf/profiles/76561198057095016#!/compare/1532476800/1532563200

Sold for 7 keys + 7.22 ref in sweets

Sale 10:

https://backpack.tf/profiles/76561198057095016#!/compare/1532476800/1532563200

https://backpack.tf/profiles/76561198105543135#!/compare/1532476800/1532563200

Only see 3 keys traceable.

Sale 11:

https://backpack.tf/profiles/76561198155320889#!/compare/1532217600/1532649600

Bulk.

Sale 12:

https://backpack.tf/profiles/76561198155320889#!/compare/1532736000/1532822400

https://backpack.tf/profiles/76561198162384989#!/compare/1532736000/1532822400

Sold for 7 keys + 23 ref

Sale 13:

https://backpack.tf/profiles/76561198162384989#!/compare/1532736000/1532822400

https://backpack.tf/profiles/76561198006544512#!/compare/1532736000/1532822400

Can only trace 5 keys.

Sale 14:

https://backpack.tf/profiles/76561198006544512#!/compare/1533168000/1533254400

https://backpack.tf/profiles/76561198165771346#!/compare/1533168000/1533254400

Sold for 7 keys + 26 ref

Sale 15:

https://backpack.tf/profiles/76561198165771346#!/compare/1533254400/1533340800

https://backpack.tf/profiles/76561198843116519#!/compare/1533254400/1533340800

Sold for Tesla Wing Mann(9.5)

Sale 16:

https://backpack.tf/profiles/76561198843116519#!/compare/1533427200/1533513600

https://backpack.tf/profiles/76561198065039841#!/compare/1533340800/1533427200

Sold for 7 keys

Sale 17:

https://backpack.tf/profiles/76561198065039841#!/compare/1533427200/1533513600

https://backpack.tf/profiles/76561198797842085#!/compare/1533427200/1533600000

Bulky.

Sale 18:

https://backpack.tf/profiles/76561198797842085#!/compare/1533772800/1533859200

https://backpack.tf/profiles/76561198042831038#!/compare/1533772800/1533859200

Untrace.

Sale 19:

https://backpack.tf/profiles/76561198042831038#!/compare/1532304000/1533772800

https://backpack.tf/profiles/76561198139389402#!/compare/1533686400/1533772800

Use there.

Sale 20:

https://backpack.tf/profiles/76561198139389402#!/compare/1533859200/1533945600

https://backpack.tf/profiles/76561198140935870#!/compare/1533772800/1533859200

Sold for 7 keys + ~1 key in sweets

Total is 8 keys

Sale 21:

https://backpack.tf/profiles/76561198140935870#!/compare/1533859200/1533945600

https://backpack.tf/profiles/76561198317061799#!/compare/1533859200/1533945600

Untrace.

Total sales @:

7, 7.06, 7.22, 7.43, 7.70, 7.79, 8, 8, 8.52, 9.5 keys

https://i.imgur.com/jLWwyLY.png

Buyers up to 7.55 keys

Sellers at 8, 9 keys.

https://backpack.tf/item/2655154835

https://backpack.tf/item/1349077221

Randy's Part:

Sale at a lil over 9 here - https://backpack.tf/profiles/76561198286234945#!/compare/1535673600/1535760000

9 Keys here as well - https://backpack.tf/profiles/76561198049204840#!/compare/1535328000/1535500800

I would include 9 here and go 8-9

Taking 8 - 9 keys.