Suggestions

Sale 1:
https://backpack.tf/profiles/76561198037674114#!/compare/1583884800/1585094400
https://backpack.tf/profiles/76561198020673987#!/compare/1584921600/1585180800
https://backpack.tf/profiles/76561198850274253#!/compare/1586304000/1586390400
untrace / Bulk

sale 2:
https://backpack.tf/profiles/76561198850274253#!/compare/1587340800/1587427200
https://backpack.tf/profiles/76561198091502579#!/compare/1587340800/1587427200
untrace

sale 3:
https://backpack.tf/profiles/76561198342161127#!/compare/1586995200/1587081600
https://backpack.tf/profiles/76561199014896023#!/compare/1582934400/1587081600
Sold for Vivid Tartan
use there, only usable sale.

sale 4:
https://backpack.tf/profiles/76561199014896023#!/compare/1582934400/1587081600
https://backpack.tf/profiles/76561198091502579#!/compare/1587340800/1587427200
Bulk

sale 5:
https://marketplace.tf/items/tf2/178;5;u18
$21 / $1.92 = 10.94 keys

sale 6:
https://backpack.tf/profiles/76561198985910282#!/compare/1587340800/1587427200
https://backpack.tf/profiles/76561198091502579#!/compare/1587340800/1587427200
Sold for ~11 keys

buyers up to 11 keys