Sale 1:

https://backpack.tf/profiles/76561198072390053#!/compare/1569369600/1571270400

https://backpack.tf/profiles/76561198337734785#!/compare/1570492800/1570579200

QS

sale 2:

https://backpack.tf/profiles/76561198313152103#!/compare/1565568000/1565913600

https://backpack.tf/profiles/76561198830746068#!/compare/1565481600/1565568000

QS

sale 3:

https://backpack.tf/profiles/76561198830746068#!/compare/1567382400/1567555200

https://backpack.tf/profiles/76561198332723633#!/compare/1567468800/1567641600

Sold for 23 keys

Sale 4:

https://backpack.tf/profiles/76561198332723633#!/compare/1568851200/1569110400

https://backpack.tf/profiles/76561198337734785#!/compare/1569024000/1569110400

QS for ~13 keys

sale 5:

https://backpack.tf/profiles/76561198377919903#!/compare/1566259200/1566604800

https://backpack.tf/profiles/76561198076113077#!/compare/1566518400/1566604800

Bulk

Sale 6:

https://backpack.tf/profiles/76561198076113077#!/compare/1567209600/1567382400

https://backpack.tf/profiles/76561198368964060#!/compare/1567296000/1567382400

Sold for HG Bloke's

Bloke Mini:

https://backpack.tf/suggestion/5db645b0d381725058185365

Suggestion for 18 keys

https://bot.tf/stats/listings/MGZ7LQ83

B/O of 24 keys

sale 7 - 10:

https://marketplace.tf/items/tf2/937;5;u58

$40 / $1.84 = 21.74 keys <--- https://backpack.tf/item/3925145739

$27.54 / $1.82 = 15.13 keys <--- https://backpack.tf/item/3925145739

$29.99 / $1.82 = 16.48 keys

$39.99 / $1.80 = 22.22 keys <--- https://backpack.tf/item/3925145739

Total sales @:

13, 15, 16, 18, 22, 22, 23 keys

unsold for 18 for a month,

https://bot.tf/stats/listings/4JG1D1L9

buyers up to 13 keys,

given that 23 resold for lower,

gonna take 15 - 22 keys, conserving around unsold.