bought for 1469.12 total

800 + 221(fresh keys) + 61.98 + 61.09 + 21 + 11.07 + 11.59 + 14 + 16 + 57 + 78.5 + 18.08 + 29.31 + 34.23 + 15.6 + 18.67 = 1469.12

https://media.discordapp.net/attachments/588169308627271692/987223578393055242/unknown.png

https://media.discordapp.net/attachments/588169308627271692/987223847851937802/unknown.png

Rounding to the nearest fifty keys makes it to 1450 keys

https://backpack.tf/profiles/76561198361999761#!/compare/1655251200/1655424000

https://backpack.tf/profiles/76561198063640894#!/compare/1655337600/1655424000

https://media.discordapp.net/attachments/588169308627271692/987212541065310268/Image_5.png

We both agreed to say the bandana was worth 800k: https://cdn.discordapp.com/attachments/588169308627271692/987210177004576788/unknown.png

To add proof, I bought the bandana for estimate of 884 keys

https://backpack.tf/profiles/76561198361999761#!/compare/1653609600/1653696000

https://backpack.tf/profiles/76561198253093948#!/compare/1653609600/1653696000

https://media.discordapp.net/attachments/588169308627271692/980214274116972594/unknown.png

B/O for Pirate Bandana was 800k

https://gladiator.tf/time-machine?item=Demonflame+Pirate+Bandana&at=2022-05-27T22%3A28%3A00.000Z

Not to mention, 800k is including within the bandana's price range.

YWN is currently buying for 78.5 keys.

https://media.discordapp.net/attachments/588169308627271692/987234736734896168/unknown.png

Spent well spirits (Infernal smoke) Being bought for 11.59

https://media.discordapp.net/attachments/588169308627271692/987245081260072970/unknown.png

Spent well Spirits (Hellish Inferno) Being bought for 11.07 keys

https://media.discordapp.net/attachments/588169308627271692/987235742180855869/unknown.png

Enchanted Didgeridrongo being bought for 34.24 keys

https://media.discordapp.net/attachments/588169308627271692/987245430914056192/unknown.png

Other sales: used for buying items to and from Joku

https://backpack.tf/profiles/76561198410760897#!/compare/1653264000/1653523200

https://backpack.tf/profiles/76561198410760897#!/compare/1654992000/1655337600

No other clear sale can be found in my research.

Let me know if you found any more info or there's something I need to fix up.