I want to credit all the work to the people previous suggestion here, such as Cloudy, Vege, Blue Fox, K1ng and Xergoyf: https://next.backpack.tf/suggestions/628e5ad10b13db5fa200eadf

Sale 1) 112 key

https://backpack.tf/profiles/76561198055622215#!/compare/1650412800/1650585600

https://backpack.tf/profiles/76561197994933458#!/compare/1650412800/1650585600

Sale 2) 115 keys:

https://backpack.tf/profiles/76561198261703372#!/compare/1650672000/1650931200

https://backpack.tf/profiles/76561198322957656#!/compare/1650844800/1650931200

Sale 3) Sold along 200 keys and double spelled Eerie Orbiting Fire Furious Fukaamigasa for double spelled Chiroptera Venenata Caribbean Conqueror:

https://backpack.tf/profiles/76561198322957656#!/compare/1650931200/1651104000

https://backpack.tf/profiles/76561198344363390#!/compare/1650672000/1651104000

Spelled outlier, I would exclude.

Sale 4) Untraced:

https://backpack.tf/profiles/76561198344363390#!/compare/1651449600/1651536000

https://backpack.tf/profiles/76561198139679163#!/compare/1651449600/1651536000

Sale 5) Sold for 188 keys pure

https://next.backpack.tf/profiles/76561198139679163/compare?from=1653350400&to=1653436800

For sale 1 and 2, 112 and 115 were slightly above buyers at the time of the sales:

https://gladiator.tf/time-machine?item=Morning+Glory+Tam+O%27+Shanter&at=2022-04-26T01%3A51%3A00.000Z

Buyers were around ~71 at the time of the 188 sale (credits Xergoyf):

https://gladiator.tf/time-machine?item=Morning+Glory+Tam+O%27+Shanter&at=2022-05-26T01%3A51%3A00.000Z

So 112 and 115 cannot be excluded, the range will be 112-188 keys or an average of 150 keys.

Please let me know if there's anything else to improve this suggestion!

Thanks and have a great day! :D