Sale 1:

https://backpack.tf/profiles/76561198392986348#!/compare/1585440000/1585526400

https://backpack.tf/profiles/76561198195784087#!/compare/1585440000/1585526400

Untrace

sale 2:

https://backpack.tf/profiles/76561198195784087#!/compare/1585440000/1585526400

https://backpack.tf/profiles/76561198271915998#!/compare/1585440000/1585526400

Sold with 2 keys for GE Warming

Warming Mini:

https://backpack.tf/suggestion/5eab899cc4754646d823a386

Suggestion for 21 keys

Total is 19 keys

sale 3:

https://backpack.tf/profiles/76561198271915998#!/compare/1585526400/1585612800

https://backpack.tf/profiles/76561197961420647#!/compare/1585526400/1585612800

Sold with ~1 key in sweets for DBD Toque

use there

sale 4:

https://backpack.tf/profiles/76561197961420647#!/compare/1585526400/1585612800

https://backpack.tf/profiles/76561198055622215#!/compare/1585526400/1585612800

Sold for HG Tank + ~2 keys in sweets

use there

Sale 5:

https://backpack.tf/profiles/76561198055622215#!/compare/1586822400/1586908800

https://backpack.tf/profiles/76561198323733331#!/compare/1586736000/1586908800

Bulk

sale 6:

https://backpack.tf/profiles/76561198323733331#!/compare/1587168000/1587254400

https://backpack.tf/profiles/76561198099686112#!/compare/1587081600/1587254400

Untrace

sale 7:

https://backpack.tf/profiles/76561198099686112#!/compare/1587254400/1587340800

https://backpack.tf/profiles/76561198236985112#!/compare/1587254400/1587513600

Sold for 17 keys

sale 8:

https://backpack.tf/profiles/76561198124628273#!/compare/1583107200/1584403200

https://backpack.tf/profiles/76561198345972230#!/compare/1582588800/1583107200

Untrace

sale 9:

https://backpack.tf/profiles/76561198345972230#!/compare/1583107200/1585094400

https://backpack.tf/profiles/76561198267189538#!/compare/1583020800/1583107200

QS

sale 10:

https://backpack.tf/profiles/76561198267189538#!/compare/1585267200/1585353600

https://backpack.tf/profiles/76561198871136698#!/compare/1585526400/1585612800

Sold for ~15 keys

sale 11:

https://backpack.tf/profiles/76561198871136698#!/compare/1585612800/1585699200

https://backpack.tf/profiles/76561198092554004#!/compare/1585440000/1585785600

Untrace

Sale 12:

https://backpack.tf/profiles/76561198061536453#!/compare/1584144000/1584230400

https://backpack.tf/profiles/76561198342161127#!/compare/1584144000/1584230400

Bulk

sale 13:

https://marketplace.tf/items/tf2/181;5;u19

$38 / $1.74 = 21.84 keys

https://backpack.tf/item/7956588572

Total sales @:

15, 17, 19, 22 keys

buyers up to ~14.58 keys,

sellers down to 20 keys,

taking 17 - 19 keys.