Sale 1:

https://backpack.tf/profiles/76561198999509189#!/compare/1592006400/1592006400

https://backpack.tf/profiles/76561198999722901#!/compare/1591833600/1592006400

https://backpack.tf/profiles/76561198305494036#!/compare/1591920000/1592006400

Scammed / QS

Sale 2:

https://backpack.tf/profiles/76561198305494036#!/compare/1592092800/1592179200

https://backpack.tf/profiles/76561198817887345#!/compare/1592092800/1592265600

Bot.tf says 18 keys, can't trace anything accurately.

sale 3:

https://backpack.tf/profiles/76561198081720791#!/compare/1591142400/1591920000

https://backpack.tf/profiles/76561198125791160#!/compare/1591056000/1591142400

Bulk

sale 4:

https://backpack.tf/profiles/76561198052852471#!/compare/1596153600/1596499200

https://backpack.tf/profiles/76561198078809482#!/compare/1596153600/1596240000

Sold for 29 keys

Sale 5:

https://backpack.tf/profiles/76561198378537090#!/compare/1596326400/1596844800

https://backpack.tf/profiles/76561198850121720#!/compare/1596758400/1596844800

Bulk / QS

sale 6:

https://backpack.tf/profiles/76561198850121720#!/compare/1596844800/1596931200

https://backpack.tf/profiles/76561198850274253#!/compare/1596844800/1596931200

QS / transfer

sale 7:

https://backpack.tf/profiles/76561198021055079#!/compare/1591228800/1591315200

https://backpack.tf/profiles/76561198984771736#!/compare/1594425600/1597536000

Untrace, likely for 19 keys:

https://bot.tf/stats/listings/Y79N1QE9

Sale 8:

https://backpack.tf/profiles/76561198100879076#!/compare/1592611200/1592697600

https://backpack.tf/profiles/76561198864631226#!/compare/1592611200/1592697600

Bulky / use there

sale 9:

https://backpack.tf/profiles/76561198864631226#!/compare/1592697600/1592784000

https://backpack.tf/profiles/76561198278481498#!/compare/1592697600/1592784000

Bulky

Sale 10:

https://backpack.tf/profiles/76561198278481498#!/compare/1592784000/1592870400

https://backpack.tf/profiles/76561198049475118#!/compare/1592784000/1593043200

Sold for 18 keys

sale 11:

https://backpack.tf/profiles/76561198049475118#!/compare/1593907200/1594080000

https://backpack.tf/profiles/76561199029568303#!/compare/1595376000/1595462400

QS

sale 12:

https://backpack.tf/profiles/76561199029568303#!/compare/1596585600/1596672000

https://backpack.tf/profiles/76561198310853086#!/compare/1596585600/1596931200

Untrace

sale 13:

https://backpack.tf/profiles/76561198310853086#!/compare/1596931200/1597536000

https://backpack.tf/profiles/76561198850121720#!/compare/1596844800/1596931200

Untrace / QS

sale 14:

https://backpack.tf/profiles/76561198850121720#!/compare/1597104000/1597104000

https://backpack.tf/profiles/76561198850274253#!/compare/1597104000/1597104000

Transfer

sale 15:

https://backpack.tf/profiles/76561198140096900#!/compare/1591315200/1591920000

https://backpack.tf/profiles/76561198279706201#!/compare/1591401600/1591488000

https://backpack.tf/profiles/76561198880361166#!/compare/1591401600/1591574400

https://backpack.tf/profiles/76561198124723591#!/compare/1591574400/1591660800

https://backpack.tf/profiles/76561198100484031#!/compare/1591660800/1591747200

https://backpack.tf/profiles/76561198036955284#!/compare/1591747200/1591833600

https://backpack.tf/profiles/76561198850274253#!/compare/1591747200/1591833600

Bulk / untrace / QS

sale 16:

https://backpack.tf/profiles/76561198850274253#!/compare/1592438400/1592524800

https://backpack.tf/profiles/76561198157274202#!/compare/1592697600/1592784000

https://backpack.tf/profiles/76561198355796365#!/compare/1592697600/1592784000

QS / Transfer

sale 17:

https://backpack.tf/profiles/76561198355796365#!/compare/1592784000/1592870400

https://backpack.tf/profiles/76561198278481498#!/compare/1592784000/1592870400

Sold for 17 keys

sale 18:

https://backpack.tf/profiles/76561198278481498#!/compare/1593129600/1594166400

https://backpack.tf/profiles/76561198063019051#!/compare/1593475200/1593561600

Sold for 18 keys

sale 19:

https://marketplace.tf/items/tf2/30369;5;u62

$35 / $1.98 = 17.68 keys

$39.99 / $2.05 = 19.51 keys <--- https://backpack.tf/item/8856577576

$39.99 / $1.99 = 20.10 keys

$45 / $1.98 = 22.73 keys

40 / 1.79 = 22.34 keys

Total sales @:

17, 18, 18, 18, 20, 20, 22, 23, 29 keys

https://i.imgur.com/JMdHeos.jpg

Buyers up to ~15 keys,

months old seller at 30,

https://backpack.tf/item/7955811687

newish seller at 20 keys,

calling 29 high,

taking 17 - 23 keys.