Thanks Mindacos :D

Sales 1 and 2

All Marketplace.tf sales

https://marketplace.tf/items/tf2/30842;5;u3019

Jun 12: $60 / $1.81 = 33.15 keys = 33 keys - Buyout at 30 keys: https://bot.tf/stats/listings/Y820NXDY - history: https://backpack.tf/item/6272298569

Aug 14: $40 / $1.83 = 21.86 keys = 22 keys - No Buyout found. - Assuming it's this history: https://backpack.tf/item/7222079028

Sale 3

Sold for 15 keys

https://backpack.tf/profiles/76561198001943905#!/compare/1564272000/1564358400

https://backpack.tf/profiles/76561198802102930#!/compare/1564272000/1564358400

Buyout matches: https://bot.tf/stats/listings/Y5RRL1R9

Sale 4

Sold for 13 keys + 1 ref

https://backpack.tf/profiles/76561198145148787#!/compare/1566000000/1566086400

https://backpack.tf/profiles/76561198974277313#!/compare/1566000000/1566086400

Buy order sale: https://bot.tf/stats/listings/MNL7PVN8

Sale 5:

Sold for 8 keys (?)

https://backpack.tf/profiles/76561198974277313#!/compare/1566086400/1566172800

Less than Itrem's buy order: https://bot.tf/stats/listings/4ZK388PQ

In quote from Minda "IMO, 22-30 is way too generous. This is further supported by the fact that neither the 30 or the 33 seller have sold after 2 months, which means that there's no new sales. The number of low sales support this.

22 flat should be better here."

and in such, 22 flat