Thanks Malibu for providing sales 2 and 3!

1/1 - https://backpack.tf/item/2048869698

Sale #1 - Sold for 306 keys, MG Tyrant's Helm (outdated at 188.5 keys), and FN Prof KS Ghost Town Stickybomb Launcher (? price)

https://backpack.tf/profiles/76561198106897791#!/compare/1620432000/1620604800

https://backpack.tf/profiles/76561198085151917#!/compare/1620518400/1620604800 (did not trace MG Tyrant)

B/O was 600 - https://gladiator.tf/listings/6098ae13d34c6233af4f6379

Mini for Tyrant (only usable one): 235 keys

https://backpack.tf/profiles/76561198067624077#!/compare/1620259200/1620691200

Mini for sticky: 16 keys

https://backpack.tf/profiles/76561198085151917#!/compare/1619827200/1619913600

Price calculation:

306 + 235 + 16 = 557 keys

Sale #2 and Sale #3 - 270 and 575 keys respectively

https://imgur.com/a/SDcKUHe

Confirmation of sale #2 - https://backpack.tf/profiles/76561198085151917#!/compare/1622937600/1623196800

Confirmation of sale #3 - https://backpack.tf/profiles/76561198295518507#!/compare/1623024000/1623196800

note both exchanges don't appear to show all the keys

270 seems low so discarded

Therefore, suggesting the new price to be 557-575 keys