Sale 1:

https://backpack.tf/profiles/76561198340634356#!/compare/1584230400/1584316800

https://backpack.tf/profiles/76561198200846930#!/compare/1584230400/1584316800

Sold for 15 keys, likely more.

sale 2:

https://backpack.tf/profiles/76561198200846930#!/compare/1587254400/1587513600

https://backpack.tf/profiles/76561198340634356#!/compare/1587340800/1587427200

QS

sale 3:

https://backpack.tf/profiles/76561198340634356#!/compare/1588032000/1588118400

https://backpack.tf/profiles/76561198257109478#!/compare/1588032000/1588118400

Sold for 29 keys

sale 4:

https://marketplace.tf/items/tf2/1118;5;u3019

$32.12 / $1.72 = 18.67 keys <---- buy order

$65.61 / $1.72 = 38.15 keys <--- https://backpack.tf/item/7318141254

$66.28 / $1.79 = 37.03 keys <--- https://backpack.tf/item/3188062751

$66.51 / $1.91 = 34.82 keys <--- https://backpack.tf/item/5296681772 | https://bot.tf/stats/listings/4R0KVQ15 B/O of 28 keys

Sale 8:

https://backpack.tf/profiles/76561198358296372#!/compare/1586563200/1586649600

https://backpack.tf/profiles/76561198101915413#!/compare/1586563200/1586649600

Sold for 25 keys

sale 9:

https://backpack.tf/profiles/76561198101915413#!/compare/1587427200/1587513600

https://backpack.tf/profiles/76561198340634356#!/compare/1587427200/1587513600

QS

sale 10:

https://backpack.tf/profiles/76561198340634356#!/compare/1590451200/1590537600

https://backpack.tf/profiles/76561198078018027#!/compare/1590537600/1590451200

Untrace

Total sales @:

25, 29, 35, 37, 38 keys

buyers up to ~23 keys,

let's call 25 low,

38 high to balance,

taking 29 - 37 keys.