Looking at this item: https://backpack.tf/item/8672576154

Sale #1

seller: https://backpack.tf/profiles/76561198002757046#!/compare/1587600000/1587686400

buyer: https://backpack.tf/profiles/76561198305494036#!/compare/1587600000/1587686400

Bp listings right before sale: https://bot.tf/stats/listings/4WX9Z0EN

Bot.tf stats says it was 9 keys, but I wasn't able to trace the trade so I'll leave it as untrace. Having said that, I still think it's safe to say it was between 9 and 10 keys.

Sale #2

This one was bought by our great honorable and almighty pricing overload Erik himself

seller: https://backpack.tf/profiles/76561198305494036#!/compare/1588291200/1588377600

buyer: https://backpack.tf/profiles/76561198091502579#!/compare/1588291200/1588377600

Bp listings right before sale: https://bot.tf/stats/listings/MNRQ6Q18

Bot.tf stats says it was 11 keys so it sure seems like it, but it's untrace :(

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Looking at this item: https://backpack.tf/item/4892692829

Sale #3

seller: https://backpack.tf/profiles/76561198106511423#!/compare/1592352000/1592524800

buyer: https://backpack.tf/profiles/76561198453055175#!/compare/1592524800/1592611200

Sold for 12 keys.

Sale #4

seller: https://backpack.tf/profiles/76561198453055175#!/compare/1592611200/1592697600

buyer: https://backpack.tf/profiles/76561198129666631#!/compare/1592611200/1592697600

Sold for 11 keys.

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Bot.tf stats for reference: https://prnt.sc/tlf1b4

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Marketplace.tf sales: https://marketplace.tf/items/tf2/30769;5;u33

Jul 19, 25.99/1.97 = 13 keys

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Even if sale #1 was traced, it would still be low. Sale #2 would be backed up by sale #4.

Going with 11-13 keys.