===History 1=== https://backpack.tf/item/6854536651

Sold for 18 keys:

https://backpack.tf/profiles/76561198421958844#!/compare/1613433600/1614038400

https://backpack.tf/profiles/76561198355556783#!/compare/1613692800/1613779200

===History 2=== https://backpack.tf/item/6971635120

Sale for 17 keys 14.11 ref: https://scrap.tf/auctions/JOK6YD

Sale for 18 keys: https://imgur.com/a/Z0cNB4Q

Sale for 17.3 on Mannco: https://mannco.store/item/12864

February 22: $33/1.91=17.28 ~17 keys

===History 3 ===https://backpack.tf/item/7150103713

UNTRACEABLE:

https://backpack.tf/profiles/76561198403035570#!/compare/1613520000/1613779200

https://backpack.tf/profiles/76561198850178158#!/compare/1613692800/1613779200

===History 4 === https://backpack.tf/item/7218609390

https://marketplace.tf/items/tf2/30974;5;u18

MP sales January 22: $49.99/2.10=23.8 ~24 keys

UNTRACEABLE:

https://backpack.tf/profiles/76561198037674114#!/compare/1610582400/1611014400

===History 5 === https://backpack.tf/item/6477495131

https://marketplace.tf/items/tf2/30974;5;u18

MP sales December 14: $47.84/1.96=24.41 ~24 keys

Current listings: https://gladiator.tf/listings/604c8e74c37632b68f8a8ae4

Sellers @ 21(originally listed 23), 20.57 - both unsold for ~1 month (https://gladiator.tf/listings/60342fdcaf781ae3e1ba239e)

Buyer @ 18.7, just disappeared to 12.6 at time of writing.

Mostly successful sales at 17-18, unsuccessful sellers support the drop since MP sales were quite some time ago.

Big thanks to Strange for helping out with my first unu suggestion!