Only 1 sale of this has happened:

Item:

https://backpack.tf/item/15082250048

Seller:https://backpack.tf/profiles/76561198060071234#!/compare/1730246400/1730332800

Buyer:https://backpack.tf/profiles/76561198200266727#!/compare/1730246400/1730332800

Sold for 280 keys pure + haunted ghosts crone's dome

Mini for crones:

https://backpack.tf/item/8870044130

Seller:https://backpack.tf/profiles/76561198986850781#!/compare/1729382400/1729468800

Buyer:https://backpack.tf/profiles/76561198200266727#!/compare/1729382400/1729468800

95 keys + Cloud 9 Desert Marauder + Purple Energy Professional's Panama + Circling TF Logo Swagman's Swatter

Cloud 9 was strange professional killstreak tornado villainous violet bazaar bargain + 8 keys

Proof: https://imgur.com/a/3meBSR

Price paid for the bazaar: https://backpack.tf/profiles/76561198200266727#!/compare/1727654400/1727740800. 20 keys

28 keys for cloud 9 marauder

Purple energy panama:

https://scrap.tf/auctions/NFI1IM

https://backpack.tf/item/11686506790

https://backpack.tf/profiles/76561198200266727#!/compare/1728777600/1728864000

Rounding to 69 keys

Circling TF Logo Swagman's Swatter:

https://backpack.tf/item/7811482850

https://imgur.com/a/1aC0Y4o

Rounding to 31 keys

95 + 28 + 69 + 31=223 for the crones

So 280 + 223 =503, rounding to 500