Credit to aj and Blaze for the help!

https://backpack.tf/item/9637923015

Ignoring trade back and bot transfers

Sale 1)

https://backpack.tf/profiles/76561198375575332#!/compare/1716249600/1719014400

Cash trade?

Sale 2)

https://marketplace.tf/items/tf2/920;5;u59;strange

Sold for $149.00

Keys on July 9 was 1$.69

https://marketplace.tf/items/tf2/5021;6

149/1.69 = 88.16 keys = ~ 90 keys

Round to 90 keys

Sale 3)

https://backpack.tf/profiles/76561198064724507#!/compare/1721347200/1721433600

Sold with 19 keys pure for a Searing Plasma Crone's Dome - Use there.

Sale 4)

https://next.backpack.tf/profiles/76561198064724507/compare?from=1723075200&to=1723161600

https://next.backpack.tf/profiles/76561198966474838/compare?from=1722643200&to=1722988800

https://backpack.tf/item/9637923015

Sold for a Bubbling Crone's Dome (Recently priced at 43 keys) and 50 keys --- 93 keys

43 + 50 = 93

Sales:

90

93

Going with a range of 90 - 93 Keys or an average of 91.5 Keys.

Feedback welcome! Thanks!