History 1: https://backpack.tf/item/8403319803

Untraceable sale:

https://backpack.tf/profiles/76561198061376237#!/compare/1601164800/1601251200

https://backpack.tf/profiles/76561198197338561#!/compare/1600992000/1601942400

History 2: https://backpack.tf/item/8382415388

Deposited to Marketplace.tf

History 3: https://backpack.tf/item/8361301371

Sold on marketplace on August 31 2020 (I can tell because "last seen on August 26", no waiy it could be the August 12 sale)

Marketplace.tf sales:

(Untraceable) August 12 2020: $65.99/1.84=35.86 keys ~36

(History 3) August 31 2020: $50/1.86=26.88 keys ~27

No Bot.tf snapshots avaliable so I can't find the buyouts

Unsold Marketplace.tf seller with a buyout of 30 keys (owner of History 2, unsold for around 3 months) so excluding 36

Going with 27