Sale #1

https://backpack.tf/item/13420968810

6 keys traced

https://backpack.tf/profiles/76561199026390261#!/compare/1758153600/1758240000

Sale #2

https://backpack.tf/item/13420968810

?

https://backpack.tf/profiles/76561198796735098#!/compare/1758499200/1758585600

Sale #3

https://backpack.tf/item/13420968810

Bulk for a Kill-a-watt duality of mantle

https://backpack.tf/profiles/76561199207750538#!/compare/1758672000/1758758400

Use there

Sale #4

https://backpack.tf/item/13420968810

Bulk for a Chromatic Corruption Stormy Storm Rimmed Raincatcher

https://backpack.tf/profiles/76561198164814063#!/compare/1758758400/1758844800

Sale #5

https://backpack.tf/item/13420968810

?

https://backpack.tf/profiles/76561198039622523#!/compare/1760140800/1760313600

Sale #6

https://backpack.tf/item/13420968810

Sold with 1 keys + RPS taunt (in date at 2 keys) for a Terror-watt bat hat (active suggestion at 15)

Seller: https://backpack.tf/profiles/76561199105971738#!/compare/1760227200/1760313600

Buyer: https://backpack.tf/profiles/76561197987314855#!/compare/1760227200/1760313600

15 - 3 = 12

12

Sale #7

https://backpack.tf/item/13420968810

Bulk for a PE Brothers in Blues

https://backpack.tf/profiles/76561198086943019#!/compare/1760227200/1760400000

Use there

Sale #8

https://backpack.tf/item/13420968810

Sold for 8 keys + an Aurora Polaris Box Trot (no usable minis, taking buyers at 3.6)

Seller: https://backpack.tf/profiles/76561198086943019#!/compare/1760832000/1760918400 (ID: 16313389456)

Buyer: https://backpack.tf/profiles/76561199092412585#!/compare/1760918400/1761004800

8 + 3.6 = 11.6

Rounding to 12

Sale #9

https://backpack.tf/item/13420968810

Untraceable

https://backpack.tf/profiles/76561199092412585#!/compare/1761004800/1761350400

Sale #10

https://backpack.tf/item/13420968810

Bulk

https://backpack.tf/profiles/76561198311498888#!/compare/1762214400/1762300800

More sales (credit to jarool)

https://backpack.tf/profiles/76561198850274253#!/compare/1765238400/1765324800 - near ID: 16493203449

https://backpack.tf/profiles/76561198998061513#!/compare/1765324800/1765411200

https://backpack.tf/item/15316902970

sold for 12 keys + ~1 key in metal

https://marketplace.tf/items/tf2/30030;5;u15 - $29.99, December 24th

https://backpack.tf/item/13420968810

https://marketplace.tf/items/tf2/5021;6 - keys were $1.85

29.99/1.85 = ~16

Current sellers:

13.61 keys on bp.tf

Sales: 6, 12, 12, 13, 16

16 is countered by seller

Final price: 12 - 13