Sale 1:

https://backpack.tf/profiles/76561198040965652#!/compare/1626998400/1627084800

https://backpack.tf/profiles/76561198105928538#!/compare/1626998400/1627084800 - Untraceable

Sale 2:

https://backpack.tf/profiles/76561198222773612#!/compare/1626998400/1627084800 - Barely any key histories match

Sale 3:

https://backpack.tf/profiles/76561198222773612#!/compare/1628208000/1628294400 - Sold for 28 keys + 10 refined + Bruiser's Bandana. Rounding to 28 flat

Sale 4:

https://backpack.tf/profiles/76561198310947290#!/compare/1628294400/1628380800 - Bulk for Smoking Hungover Hero

Sale 5:

https://backpack.tf/profiles/76561198198440035#!/compare/1628294400/1628380800 - Sold for nearly 300 items which comes to roughly 32 keys

https://gladiator.tf/listings/610c9e5d54badcf723c4c9f1 - B/O was 33

Sale 6:

https://backpack.tf/profiles/76561198421800249#!/compare/1622592000/1622678400 - Untraceable

Sale 7:

https://backpack.tf/profiles/76561199071286859#!/compare/1622419200/1622592000 - Sold for Terror-Watt Hermes + 7 keys (Below buyers)

Sale 8:

https://backpack.tf/profiles/76561199111658162#!/compare/1627430400/1627516800 - Untraceable

Sale 9:

https://backpack.tf/profiles/76561198029415719#!/compare/1626825600/1627776000 - Sold to buy order

Going with 28-32