Looking at this item: https://backpack.tf/item/8876008405

Sale #1

seller: https://backpack.tf/profiles/76561198135388328#!/compare/1592784000/1592870400

buyer: https://backpack.tf/profiles/76561198254900596#!/compare/1592352000/1592870400

Sold for 6 keys.

Sale #2

seller:https://backpack.tf/profiles/76561198254900596#!/compare/1592870400/1593043200

buyer: https://backpack.tf/profiles/76561198305494036#!/compare/1592956800/1593043200

bp listings at time of sale: https://bot.tf/stats/listings/Y790WONL

also: https://prnt.sc/tf8mhw

Sold for 5.5 keys.

Quicksell

Sale #3

https://prnt.sc/tf8o56

other sale at 6 keys?

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mp sales

https://marketplace.tf/items/tf2/31038;5;u33

Apr 16, 13.00$/1.78$ = 7.5 keys

Jun 25, 15.99$/1.99$ = 8 keys

Jun 29, 8.16$/2.01$ = 4 keys

Jul 6, 15.99$/1.99$ = 8 keys

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Going with 6-8 keys.