Sale 1:

https://backpack.tf/profiles/76561198795826430#!/compare/1590883200/1590969600

https://backpack.tf/profiles/76561198845896241#!/compare/1590883200/1590969600

https://backpack.tf/profiles/76561198215723856#!/compare/1590883200/1590969600

Untrace

sale 2:

https://backpack.tf/profiles/76561198215723856#!/compare/1590969600/1591056000

https://backpack.tf/profiles/76561198100836666#!/compare/1590969600/1591056000

Bulk

sale 3:

https://backpack.tf/profiles/76561198795415620#!/compare/1563321600/1591056000

https://backpack.tf/profiles/76561198056763404#!/compare/1590883200/1591315200

untrace

sale 4:

https://backpack.tf/profiles/76561198872796421#!/compare/1586822400/1586908800

https://backpack.tf/profiles/76561198208328668#!/compare/1586736000/1586822400

Bulky

sale 5:

https://backpack.tf/profiles/76561198208328668#!/compare/1586822400/1586908800

https://backpack.tf/profiles/76561198306691858#!/compare/1586822400/1586908800

Untrace

sale 6:

https://backpack.tf/profiles/76561198306691858#!/compare/1586908800/1586995200

https://backpack.tf/profiles/76561198183879153#!/compare/1586908800/1586995200

Sold for ~12 keys

Sale 7:

https://marketplace.tf/items/tf2/1157;5;u3009

$19.2 / $1.80 = 10.67 keys

$26 / $1.87 = 13.90 keys

$26 / $1.90 = 13.68 keys

$26 / $1.90 = 13.68 keys

Total sales @:

11, 12, 14, 14, 14 keys

3 buyers at 14 keys,

2 universal are above other sellers that aren't universal, which points to them being outliers,

let's take 14 flat, for now.