So I may have forgotten to actually put in the range while having a beer...

Item 1

https://backpack.tf/item/6299284792

Sale 1 - $901.76/$2.51 = 359.26 = 360~ Keys

https://imgur.com/v6qm9YI

Keys @ 10PM May 16th - $2.51

https://imgur.com/npgvop1

Item 2

https://backpack.tf/item/6290464103

Sale 1 - 300 Keys

https://cdn.discordapp.com/attachments/832229050130497537/847983545799409674/unknown.png

https://backpack.tf/profiles/76561198045812860#!/compare/1621987200/1622073600

https://backpack.tf/profiles/76561198198896481#!/compare/1621900800/1622073600

Only sales this year are for 360 and 300, Item 2's prior owner had a B/O listed for 350 (Only proof I have, but mods can check: https://cdn.discordapp.com/attachments/832229050130497537/847526176242139166/unknown.png), but promptly taken down when buyer obtained keys, aside all other sales are outdated, >2 months, so going with 300 - 360.

Low: 300

High: 360

First range suggestion, lmk how I did.