Resuggestion, thank to K1ng for catching that range error!

Sale 1:

https://backpack.tf/profiles/76561198174748513#!/compare/1565913600/1567036800

https://backpack.tf/profiles/76561198021055079#!/compare/1566950400/1567036800

Sold for 11 keys (QS)

Sale 2:

https://backpack.tf/profiles/76561198134652336#!/compare/1566691200/1566777600

https://backpack.tf/profiles/76561198026129220#!/compare/1566691200/1566777600

Untrace

sale 3:

https://backpack.tf/profiles/76561198109506971#!/compare/1567555200/1567728000

https://backpack.tf/profiles/76561198084813853#!/compare/1566432000/1567555200

https://backpack.tf/profiles/76561198880384227#!/compare/1566345600/1567641600

Untrace / QS

Sale 4:

https://backpack.tf/profiles/76561197979774655#!/compare/1570838400/1571011200

https://backpack.tf/profiles/76561198157621024#!/compare/1570838400/1571011200

Sold for DBD Larrikin + ~8 keys in sweets

Larrikin Mini:

https://backpack.tf/suggestion/5dafc01967807276b5283d8a

Suggestion for 10.25 keys

Total is ~18 keys

https://bot.tf/stats/listings/Y7DZ1P3W

B/O of 17 keys

Sale 5:

https://backpack.tf/profiles/76561198157621024#!/compare/1571011200/1571788800

https://backpack.tf/profiles/76561198335295794#!/compare/1570924800/1571011200

Untrace

Sale 6:

https://backpack.tf/profiles/76561198335295794#!/compare/1570924800/1571011200

https://backpack.tf/profiles/76561198945548843#!/compare/1568073600/1571011200

Sold for 9 keys

Sale 7:

https://backpack.tf/profiles/76561198945548843#!/compare/1571011200/1571097600

https://backpack.tf/profiles/76561198125894529#!/compare/1570924800/1571011200

Sold for TW HWAH + 3 keys

HWAH Mini:

https://backpack.tf/suggestion/5dafb124d38172556c667e8d

Suggestion for 10.5 keys

Total is 13.5 keys

Sale 8:

https://backpack.tf/profiles/76561198125894529#!/compare/1571097600/1571270400

https://backpack.tf/profiles/76561198442522722#!/compare/1571184000/1571270400

Sold with some ref for Strange KaW Tundra

use there

Sale 9:

https://backpack.tf/profiles/76561198102387360#!/compare/1565222400/1565913600

https://backpack.tf/profiles/76561198282455210#!/compare/1565827200/1565913600

untrace

Sale 10:

https://backpack.tf/profiles/76561198282455210#!/compare/1566259200/1566345600

https://backpack.tf/profiles/76561198377165880#!/compare/1566259200/1566345600

Sold for ~11 keys

Sale 11:

https://backpack.tf/profiles/76561198377165880#!/compare/1569024000/1569110400

https://backpack.tf/profiles/76561198414976747#!/compare/1568851200/1569110400

Sold for RoF Handcraft + ~12 keys in sweets

Handcraft Mini:

https://backpack.tf/suggestion/5dafb6e5678072749f2c879b

Suggestion for 16.5 keys

Total is 28.5 keys

Sale 12:

https://backpack.tf/profiles/76561198414976747#!/compare/1570320000/1570492800

https://backpack.tf/profiles/76561198337734785#!/compare/1570233600/1570320000

Sold for ~20 keys

Sale 13:

https://backpack.tf/profiles/76561198037947164#!/compare/1564099200/1564185600

https://backpack.tf/profiles/76561198134652336#!/compare/1564099200/1564272000

Untrace

Sale 14:

https://backpack.tf/profiles/76561198106599513#!/compare/1565740800/1566086400

https://backpack.tf/profiles/76561198134652336#!/compare/1566086400/1566345600

SCM

sale 15:

https://backpack.tf/profiles/76561198134652336#!/compare/1566691200/1566777600

https://backpack.tf/profiles/76561198026129220#!/compare/1566691200/1566777600

QS

sale 16:

https://backpack.tf/profiles/76561198003926663#!/compare/1567555200/1567641600

https://backpack.tf/profiles/76561198139257833#!/compare/1567555200/1567641600

https://backpack.tf/profiles/76561198141232666#!/compare/1567555200/1567641600

https://backpack.tf/profiles/76561198141232666#!/compare/1567641600/1567728000

https://backpack.tf/profiles/76561197960876323#!/compare/1568160000/1571184000

Gambling?

Sale 17:

https://marketplace.tf/items/tf2/30314;5;u57

$29.99 / $1.81 = 16.57 keys <--- https://backpack.tf/item/7955822060

$29.99 / $1.81 = 16.57 keys <-- https://backpack.tf/item/7957617695

$50 / $1.82 = 27.47 keys

Total sales @:

9, 11, 11, 13.5, 16.57, 16.57, 17, 20, 27.47, 28.5 keys

https://i.imgur.com/V7YtM8M.png

sellers for ~18 keys,

and cache shows previous unsolds for 18 keys as well.

gonna take 14 - 17 keys, calling 11 low by buyers, 20 high by unsolds (zol technically unsold at ~18 for at least 2 weeks or so.)

K1ng's Part:

Sale at 18 is capped at 17.