Sale 1:

https://backpack.tf/profiles/76561198079853142#!/compare/1583280000/1583366400

https://backpack.tf/profiles/76561198006544512#!/compare/1583280000/1583366400

QS

sale 2:

https://backpack.tf/profiles/76561198006544512#!/compare/1583452800/1583539200

https://backpack.tf/profiles/76561198138113081#!/compare/1583366400/1583539200

Sold for 20 keys

Sale 3:

https://backpack.tf/profiles/76561198138113081#!/compare/1583366400/1583539200

https://backpack.tf/profiles/76561198049149130#!/compare/1583280000/1583539200

untrace

sale 4:

https://backpack.tf/profiles/76561198049149130#!/compare/1583539200/1583625600

https://backpack.tf/profiles/76561198850274253#!/compare/1583452800/1583539200

QS

sale 5:

https://backpack.tf/profiles/76561198850274253#!/compare/1587686400/1587772800

https://backpack.tf/profiles/76561198245531998#!/compare/1587686400/1587772800

Sold for 11 keys

sale 6:

https://backpack.tf/profiles/76561198245531998#!/compare/1588032000/1588118400

https://backpack.tf/profiles/76561198062503031#!/compare/1587945600/1588118400

Sold for keys, can trace 6

sale 7:

https://backpack.tf/profiles/76561198062503031#!/compare/1588464000/1588550400

https://backpack.tf/profiles/76561198302443473#!/compare/1588118400/1588464000

Sold for 20 keys

sale 8:

https://backpack.tf/profiles/76561198302443473#!/compare/1589155200/1589241600

https://backpack.tf/profiles/76561198208741947#!/compare/1589155200/1589241600

Sold with 2 keys for Vivid Safe

use there

https://bot.tf/stats/listings/4ZPV6XPD

B/O of 22 keys

sale 9:

https://backpack.tf/profiles/76561198208741947#!/compare/1589155200/1589241600

https://backpack.tf/profiles/76561198153635100#!/compare/1589155200/1589241600

Untrace

sale 10:

https://backpack.tf/profiles/76561198153635100#!/compare/1589155200/1589241600

https://backpack.tf/profiles/76561198336787260#!/compare/1589155200/1589241600

sold for 17 keys

Sale 11:

https://backpack.tf/profiles/76561198336787260#!/compare/1589241600/1589328000

https://backpack.tf/profiles/76561198386373738#!/compare/1589155200/1589241600

sold for 17 keys (18th sold for refined)

sale 12:

https://backpack.tf/profiles/76561198386373738#!/compare/1589328000/1589414400

https://backpack.tf/profiles/76561198895128280#!/compare/1589241600/1589328000

Can trace 4 keys

sale 13:

https://backpack.tf/profiles/76561198895128280#!/compare/1589328000/1589414400

https://backpack.tf/profiles/76561198986747837#!/compare/1589328000/1589414400

Untrace

sale 14:

https://backpack.tf/profiles/76561198337734785#!/compare/1586044800/1586131200

https://backpack.tf/profiles/76561198242301690#!/compare/1586044800/1586131200

Untrace

Sale 15:

https://backpack.tf/profiles/76561198242301690#!/compare/1586044800/1586131200

https://backpack.tf/profiles/76561198026129220#!/compare/1586044800/1586131200

sold with 16 keys for DBD Thirst

bulky

sale 16:

https://backpack.tf/profiles/76561198026129220#!/compare/1586131200/1586217600

https://backpack.tf/profiles/76561198164241069#!/compare/1576108800/1587945600

Untrace

sale 17:

https://backpack.tf/profiles/76561198164241069#!/compare/1588204800/1588291200

https://backpack.tf/profiles/76561198147711115#!/compare/1583452800/1588464000

Sold for ~20 keys

sale 18:

https://backpack.tf/profiles/76561198850274253#!/compare/1586563200/1586649600

https://backpack.tf/profiles/76561198086225607#!/compare/1586649600/1586995200

Untrace

Sale 19:

https://backpack.tf/profiles/76561198086225607#!/compare/1586649600/1586995200

https://backpack.tf/profiles/76561198879844705#!/compare/1586736000/1586995200

Sold for 19 keys

sale 20:

https://backpack.tf/profiles/76561198879844705#!/compare/1586736000/1586995200

https://backpack.tf/profiles/76561198272038643#!/compare/1586908800/1586995200

Sold for CPS Noble + 1 key

use there

sale 21:

https://marketplace.tf/items/tf2/760;5;u61

$36.99 / $1.77 = 20.90 keys

Total sales @:

11, 17, 17, 19, 20, 20, 20, 21 keys

buyers up to 16 keys,

new seller at 20 keys,

taking 17 - 21 keys.