Relevant compare here:

https://backpack.tf/profiles/76561198276212223#!/compare/1543104000/1543449600

Multiple other sales occurred, though:

frostbite TC + ominous night sq dance

https://backpack.tf/profiles/76561198038816671#!/compare/1540598400/1540771200

Stormy 13th whoopee + 300 keys

https://backpack.tf/profiles/76561198116427955#!/compare/1543363200/1543449600

400 pure:

https://backpack.tf/profiles/76561198032131059#!/compare/1540771200/1540857600

400 keys match, but it may be worth verifying since much unboxing was done that day by the same user

Bulk

https://backpack.tf/profiles/76561198069980430#!/compare/1541721600/1541808000

The last sale isn't really usable, but the other sales seem to indicate that the crones sale will be on the high side.