Sale 1:

https://backpack.tf/profiles/76561198013207659#!/compare/1560816000/1560902400

https://backpack.tf/profiles/76561198048140234#!/compare/1560816000/1560902400

Sold for 13 keys

Sale 2:

https://backpack.tf/profiles/76561198048140234#!/compare/1561075200/1561161600

https://backpack.tf/profiles/76561198440426652#!/compare/1561161600/1561248000

Sold for ~22 keys in sweets(?)

https://bot.tf/stats/listings/4E1LNPEY

B/O of 15 keys, capping

Sale 3:

https://backpack.tf/profiles/76561198440426652#!/compare/1561161600/1561248000

https://backpack.tf/profiles/76561198063372917#!/compare/1561248000/1561334400

untrace(keys don't match)

Sale 4:

https://backpack.tf/profiles/76561198063372917#!/compare/1561334400/1561420800

https://backpack.tf/profiles/76561198087557454#!/compare/1561334400/1561420800

Keys, can only trace 4...

Sale 5:

https://backpack.tf/profiles/76561198087557454#!/compare/1564790400/1565913600

https://backpack.tf/profiles/76561198315881059#!/compare/1564444800/1566000000

Untrace

Sale 6:

https://backpack.tf/profiles/76561198013609065#!/compare/1560729600/1560816000

https://backpack.tf/profiles/76561198249763076#!/compare/1560816000/1560902400

Sold for CH Airdog

use there

Sale 7:

https://backpack.tf/profiles/76561198249763076#!/compare/1560902400/1560988800

https://backpack.tf/profiles/76561198337734785#!/compare/1560902400/1560988800

Sold for ~11 keys

Sale 8:

https://backpack.tf/profiles/76561198337734785#!/compare/1561593600/1561680000

https://backpack.tf/profiles/76561198082205267#!/compare/1560988800/1561680000

Sold for 14 keys

Sale 9:

https://backpack.tf/profiles/76561198082205267#!/compare/1561766400/1562112000

https://backpack.tf/profiles/76561198337982050#!/compare/1562025600/1562112000

Sold for G Fetti Field Practice + ~1 key in sweets

use there

https://bot.tf/stats/listings/4O5D90PY

B/O of ~15 keys

Sale 10:

https://backpack.tf/profiles/76561198337982050#!/compare/1562025600/1562112000

https://backpack.tf/profiles/76561198337734785#!/compare/1562112000/1562198400

QS

Sale 11:

https://backpack.tf/profiles/76561198121846726#!/compare/1559174400/1561852800

https://backpack.tf/profiles/76561198080179568#!/compare/1561766400/1561852800

SCM

Sale 12:

https://backpack.tf/profiles/76561198080179568#!/compare/1563148800/1563235200

https://backpack.tf/profiles/76561198311004039#!/compare/1563235200/1564272000

Sold for ~13 keys

Sale 13:

https://backpack.tf/profiles/76561198118875185#!/compare/1563235200/1563321600

https://backpack.tf/profiles/76561198148983233#!/compare/1563235200/1563321600

Sold for HG Airdog(11.5)

Sale 14 - 19:

https://marketplace.tf/items/tf2/107;5;u33

$26.5 / $1.82 = 14.56 keys <-- https://backpack.tf/item/5963326917

$28.28 / $1.82 = 15.54 keys <-- https://backpack.tf/item/1350124305

$29.17 / $1.84 = 15.85 keys <-- https://backpack.tf/item/6922708505

$28.46 / $1.82 = 15.64 keys

$25.6 / $1.80 = 14.22 keys <-- https://backpack.tf/item/1350124305 OR https://backpack.tf/item/5963326917 can't tell.

Total sales @:

11, 11.5, 13, 13, 14, 15, 15.54, 15.65, 15.85 keys

Unsold for half a year for ~15 keys,

taking 11 - 15 keys.