Sale 1:

https://backpack.tf/profiles/76561198176405094#!/compare/1588204800/1588377600

https://backpack.tf/profiles/76561198204305245#!/compare/1588291200/1588377600

Untrace / QS

Sale 2:

https://backpack.tf/profiles/76561198087397889#!/compare/1592784000/1592870400

https://backpack.tf/profiles/76561198165261184#!/compare/1592870400/1592956800

= 16 Keys.

Sale 3:

https://backpack.tf/profiles/76561198165261184#!/compare/1592956800/1593302400

https://backpack.tf/profiles/76561198091502579#!/compare/1592956800/1593043200

= 17 Keys?

Sale 4:

https://backpack.tf/profiles/76561198880377562#!/compare/1588377600/1594512000

https://backpack.tf/profiles/76561199018386462#!/compare/1588550400/1594512000

???

Sale 5:

https://backpack.tf/profiles/76561199018386462#!/compare/1588550400/1594512000

https://backpack.tf/profiles/76561198036955284#!/compare/1588464000/1588636800

???

Sale 6:

https://backpack.tf/profiles/76561198036955284#!/compare/1588636800/1588809600

https://backpack.tf/profiles/76561197978439752#!/compare/1589068800/1591056000

Untrace

Sale 7:

https://backpack.tf/profiles/76561197978439752#!/compare/1589068800/1591056000

https://backpack.tf/profiles/76561198424596993#!/compare/1588982400/1589155200

Untrace

Sale 8:

https://backpack.tf/profiles/76561198424596993#!/compare/1589241600/1589500800

https://backpack.tf/profiles/76561198358482558#!/compare/1589155200/1589241600

Sold for Blizzardy Storm Bat Hat, using there

Sale 9:

https://backpack.tf/profiles/76561198358482558#!/compare/1590969600/1591056000

https://backpack.tf/profiles/76561197978439752#!/compare/1589068800/1591056000

= 13 Keys / Untrace / Low

Sale 10:

https://backpack.tf/profiles/76561197978439752#!/compare/1589068800/1591056000

https://backpack.tf/profiles/76561198080179568#!/compare/1590969600/1591056000

Untrace

Sale 11:

https://backpack.tf/profiles/76561198080179568#!/compare/1591833600/1591920000

https://backpack.tf/profiles/76561198086548576#!/compare/1591747200/1591920000

= 17 Keys.

Marketplace.tf: https://marketplace.tf/items/tf2/384;5;u62

Sale 12:

$39.99 / $1.87 = 21.39 keys = 21 Keys.

No B/O

Sale 13:

$39.99 / $1.89 = 21.16 keys = 21 KEys.

No B/O

Sale 14:

$39.99 / $1.89 = 21.16 keys = 21 Keys.

No B/O

Sale 15:

$49.99 / $2.01 = 24.87 keys = 25 Keys. (high)

No B/O

Sales: 13, 16, 17, 17, 21, 21, 21, 25

Current classified https://gyazo.com/8f9ce00c7e3a0b808d076492690d7f39

Makes the mp.tf sales high

Going with 16-17 keys!