Sale 1:

https://backpack.tf/profiles/76561198278450800#!/compare/1588982400/1589155200

https://backpack.tf/profiles/76561198059314751#!/compare/1589068800/1589155200

Bulky / use there

sale 2:

https://backpack.tf/profiles/76561198145072434#!/compare/1594252800/1594339200

https://backpack.tf/profiles/76561198139431507#!/compare/1594166400/1594339200

https://backpack.tf/profiles/76561198097171432#!/compare/1594252800/1594339200

https://backpack.tf/profiles/76561198139431507#!/compare/1594166400/1594339200'

https://backpack.tf/profiles/76561198850121720#!/compare/1594512000/1596672000

Untrace, transfer, QS

sale 3:

https://backpack.tf/profiles/76561198850121720#!/compare/1596240000/1596326400

https://backpack.tf/profiles/76561198850274253#!/compare/1596240000/1596326400

Transfer

sale 4:

https://backpack.tf/profiles/76561198107134661#!/compare/1590192000/1590278400

https://backpack.tf/profiles/76561198411392321#!/compare/1590192000/1590278400

Sold for 11 keys

sale 5:

https://backpack.tf/profiles/76561198411392321#!/compare/1590192000/1590278400

https://backpack.tf/profiles/76561198046579190#!/compare/1590192000/1590278400

Sold for Blizzardy Toy Soldier(12)

sale 6:

https://backpack.tf/profiles/76561198046579190#!/compare/1590364800/1590451200

https://backpack.tf/profiles/76561198396499936#!/compare/1590364800/1590451200

QS / Bulk

sale 7:

https://backpack.tf/profiles/76561198396499936#!/compare/1592352000/1592438400

https://backpack.tf/profiles/76561198301649793#!/compare/1592179200/1592438400

Sold for ~15 keys in sweets (note that hat is spelled)

sale 8:

https://backpack.tf/profiles/76561198301649793#!/compare/1594598400/1595203200

https://backpack.tf/profiles/76561199047256261#!/compare/1594512000/1596153600

Untrace

total sales @:

11, 12, 15 keys

https://i.imgur.com/Flx0WTt.png

cache shows 12 key seller unsold for almost a month,

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

months unsold at 15, 17 keys,

new seller at ~10 keys,

https://backpack.tf/item/399777718

watching seller, taking 11 - 12 keys (excluding 15 due to sellers + hat may be worth more due to spell)