Resuggest: https://backpack.tf/suggestion/5e12a4fe57c3c8436e5ec521

Sale 1+2:

https://marketplace.tf/items/tf2/150;5;u18

$54.99 / $1.77 = 31.07 keys // b/o 21: https://imgur.com/a/F7zOtBj

$47.25 / $1.66 = 28.46 keys // https://backpack.tf/item/359845229

Sale 3:

using on Sterling

https://backpack.tf/profiles/76561198005590158#!/compare/1576022400/1576108800

https://backpack.tf/profiles/76561198107793922#!/compare/1575936000/1576108800

Sale 4:

DBD Runner's Warm-Up(17)

https://backpack.tf/profiles/76561198107793922#!/compare/1576108800/1576195200

https://backpack.tf/profiles/76561198175470618#!/compare/1576108800/1576195200

warm up: https://backpack.tf/suggestion/5e128ce73154ff56f961f5e2

Sale 5:

untrace

https://backpack.tf/profiles/76561198049761080#!/compare/1570838400/1570924800

https://backpack.tf/profiles/76561198049072796#!/compare/1570838400/1570924800

Sale 6:

17 pure

https://backpack.tf/profiles/76561198049072796#!/compare/1571356800/1571529600

https://backpack.tf/profiles/76561198066337763#!/compare/1571529600/1574553600

Sale 7:

13 keys + 30 ref - buy order: https://imgur.com/a/AKpv3jd

https://backpack.tf/profiles/76561198066337763#!/compare/1577664000/1577750400

https://backpack.tf/profiles/76561198344291072#!/compare/1577664000/1577750400

Sale 8:

bulk

https://backpack.tf/profiles/76561198344291072#!/compare/1578009600/1578096000

https://backpack.tf/profiles/76561198231082180#!/compare/1578009600/1578096000

==============================================================================

Credits to k1ng:

Recent sale on marketplace, capped at 25:

https://backpack.tf/item/366202215

https://bot.tf/stats/listings/4JGXE06X

Not the best sale to use here.

https://backpack.tf/profiles/76561198063029136#!/compare/1579305600/1579564800

https://backpack.tf/profiles/76561198313704489#!/compare/1579478400/1579564800

Could be used there

https://backpack.tf/profiles/76561198313704489#!/compare/1579737600/1579824000

“17-25 should be fine. 28 is above previous B/Os so fine to exclude.”