Credit to aj and Jarool for the help here.

6 Years Later...... a slight rise

Sale 1)

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

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

https://next.backpack.tf/item/1846944779

Bulk

Sale 2)

https://next.backpack.tf/profiles/76561198966474838/compare?from=1721952000&to=1722211200

https://next.backpack.tf/profiles/76561199111073161/compare?from=1722038400&to=1722124800

https://next.backpack.tf/item/1846944779

Sold for another Bubbling Crone's Dome

Sale 3)

https://next.backpack.tf/profiles/76561198155659357/compare?from=1720828800&to=1720915200

https://next.backpack.tf/profiles/76561199111073161/compare?from=1720828800&to=1720915200

https://next.backpack.tf/item/1846944779

Sold for 21 Keys and 1 Scrap Metal - Exclude - Below Buy Orders - https://next.backpack.tf/classifieds/snapshots/Bubbling%20Crone's%20Dome - Buy Orders at 36 keys

Sale 4)

https://next.backpack.tf/profiles/76561198155659357/compare?from=1720396800&to=1720569600

https://next.backpack.tf/item/1846944779

Untraced

Sale 5)

https://next.backpack.tf/profiles/76561199110809353/compare?from=1720396800&to=1720483200

https://next.backpack.tf/item/1846944779

Untraced

Sale 6)

https://next.backpack.tf/profiles/76561199652290612/compare?from=1717632000&to=1717718400

https://next.backpack.tf/profiles/76561199110809353/compare?from=1717632000&to=1717718400

https://next.backpack.tf/item/1846944779

Bulk

Sale 7)

https://next.backpack.tf/profiles/76561198009914215/compare?from=1717664767&to=1717751167

https://next.backpack.tf/profiles/76561199652290612/compare?from=1717632000&to=1717718400

https://next.backpack.tf/item/1846944779

Gamble

Sale 8)

https://next.backpack.tf/profiles/76561198145331385/compare?from=1717372800&to=1717459200

https://next.backpack.tf/profiles/76561198009914215/compare?from=1717372800&to=1717459200

https://next.backpack.tf/item/1846944779

Untraced

Sale 9)

https://next.backpack.tf/profiles/76561198111200240/compare?from=1717027200&to=1718323200

https://next.backpack.tf/item/1846944779

Gamble

Sale 10)

https://next.backpack.tf/profiles/76561199084784906/compare?from=1718064000&to=1718150400

https://next.backpack.tf/profiles/76561198361085190/compare?from=1715990400&to=1718928000

https://next.backpack.tf/item/1846944779

Bulk

Sale 11)

https://next.backpack.tf/profiles/76561198361085190/compare?from=1715990400&to=1718928000

https://next.backpack.tf/profiles/76561198850178158/compare?from=1718841600&to=1718928000

https://next.backpack.tf/item/1846944779

Untraced

Sale 12)

https://next.backpack.tf/profiles/76561198850178158/compare?from=1722902400&to=1722988800

https://next.backpack.tf/profiles/76561198069659994/compare?from=1722902400&to=1722988800

https://next.backpack.tf/item/1846944779

Untraced

Sale 13)

https://next.backpack.tf/profiles/76561198069659994/compare?from=1722902400&to=1722988800

https://next.backpack.tf/profiles/76561198379709707/compare?from=1722902400&to=1722988800

https://next.backpack.tf/item/1846944779

Gamble

Sale 14)

https://next.backpack.tf/profiles/76561198057476558/compare?from=1715990400&to=1716076800

https://next.backpack.tf/profiles/76561199026390261/compare?from=1715990400&to=1716076800

https://next.backpack.tf/item/14708472295

Bulk

Sale 15)

https://next.backpack.tf/profiles/76561199026390261/compare?from=1717804800&to=1717891200

https://next.backpack.tf/profiles/76561198128199745/compare?from=1717804800&to=1717891200

https://next.backpack.tf/item/14708472295

Untraced

Sale 16)

https://next.backpack.tf/profiles/76561198128199745/compare?from=1719619200&to=1720051200

https://next.backpack.tf/profiles/76561199179129452/compare?from=1719619200&to=1719705600

https://next.backpack.tf/item/14708472295

Untraced

Sale 17)

https://next.backpack.tf/profiles/76561199179129452/compare?from=1719619200&to=1719705600

https://next.backpack.tf/profiles/76561198068986329/compare?from=1719619200&to=1719705600

https://next.backpack.tf/item/14708472295

Untraced

Sale 18)

https://next.backpack.tf/profiles/76561198068986329/compare?from=1719878400&to=1720051200

https://next.backpack.tf/profiles/76561198402614129/compare?from=1719792000&to=1720137600

https://next.backpack.tf/item/14708472295

Untraced

Sale 19)

https://next.backpack.tf/profiles/76561198402614129/compare?from=1720137600&to=1720224000

https://next.backpack.tf/profiles/76561198368630101/compare?from=1720137600&to=1720310400

https://next.backpack.tf/item/14708472295

Untraced

Sale 20)

https://next.backpack.tf/profiles/76561198368630101/compare?from=1720137600&to=1720310400

https://next.backpack.tf/profiles/76561199193412191/compare?from=1720137600&to=1720224000

https://next.backpack.tf/item/14708472295

Untraced

Sale 21)

https://next.backpack.tf/profiles/76561199193412191/compare?from=1721347200&to=1721433600

https://next.backpack.tf/profiles/76561198043762955/compare?from=1721347200&to=1721433600

https://next.backpack.tf/item/14708472295

Untraced

Sale 22)

https://next.backpack.tf/profiles/76561198043762955/compare?from=1721520000&to=1721606400

https://next.backpack.tf/profiles/76561198981403984/compare?from=1721520000&to=1721606400

https://next.backpack.tf/item/14708472295

Untraced

Sale 23)

https://next.backpack.tf/profiles/76561199716259377/compare?from=1721520000&to=1721606400

https://next.backpack.tf/profiles/76561199716259377/compare?from=1721520000&to=1721606400

https://next.backpack.tf/item/14708472295

Sold for 38 Keys

Sale 24)

https://next.backpack.tf/profiles/76561198966474838/compare?from=1721779200&to=1722211200

https://next.backpack.tf/profiles/76561199716259377/compare?from=1721779200&to=1721865600

https://next.backpack.tf/item/14708472295

Sold for a Bubbling Crone's Dome which was similar to Sale 2.

Sale 25)

https://next.backpack.tf/profiles/76561198966474838/compare?from=1721779200&to=1721952000

https://next.backpack.tf/profiles/76561199387937964/compare?from=1721779200&to=1721952000

https://next.backpack.tf/item/14708472295

Untraced

Sale 26)

https://next.backpack.tf/profiles/76561199387937964/compare?from=1721952000&to=1722124800

https://next.backpack.tf/profiles/76561198360689424/compare?from=1721952000&to=1722038400

https://next.backpack.tf/item/14708472295

Untraced

Sale 27)

https://next.backpack.tf/profiles/76561198360689424/compare?from=1722643200&to=1722729600

https://next.backpack.tf/profiles/76561198170456861/compare?from=1722643200&to=1723075200

https://next.backpack.tf/item/14708472295

Spycrab Gamble?

Sale 27)

Jarool:

https://backpack.tf/item/10616613090 - missing sales from this history

https://backpack.tf/profiles/76561198021055079#!/compare/1721520000/1721606400

https://backpack.tf/profiles/76561198076301164#!/compare/1721606400/1722211200

https://imgur.com/a/pnKdPKg - 44 keys

Sale 28)

https://backpack.tf/profiles/76561198055077512#!/compare/1720915200/1721001600

https://backpack.tf/profiles/76561198021055079#!/compare/1720656000/1721001600

Sales:

21 - Exclude

38

44

Going with a range of 38 - 44 keys or an average of 41 keys.

Feedback welcome. Thanks!