Resuggesting, thanks Xerg

Marketplace.tf Sales:

https://marketplace.tf/items/tf2/31034;5;u61

October 12: $10.05 / $1.88 = 5.35 keys, rounding down to 5 keys. Low, excluding.

October 16: $21.99 / $1.88 = 11.70 keys, rounding up to 12 keys.

Item 1:

https://backpack.tf/item/7525435267

Sale 1:

https://backpack.tf/profiles/76561199095370008#!/compare/1604620800/1604966400

https://backpack.tf/profiles/76561199064056720#!/compare/1604966400/1605139200

9 keys + '72 Taunt: The Trackman's Touchdown.

Trackman's Touchdown was quicksold to a bot right after for 2 keys and 26.11 ref. ( https://backpack.tf/item/6470459858)

Keys were 53.77 ref at the time of the sale, which means 26.11 rounds down. (https://bot.tf/stats/listings/420OVVQ7)

Taking 11-12 keys.