3 years!

Explo accepting this sugg would be matching ;3

Sale #1:

https://backpack.tf/item/1692104815

https://backpack.tf/profiles/76561199210212807#!/compare/1747180800/1747440000

https://backpack.tf/profiles/76561199745887780#!/compare/1747353600/1747440000

75 pure apparently according to edin

Sale #2:

https://backpack.tf/profiles/76561199745887780#!/compare/1746403200/1746489600 ~ 70 keys

https://backpack.tf/profiles/76561199210212807#!/compare/1746144000/1746403200

Sale #3:

Confusing because he seems to obtain it together in bulk here:

https://backpack.tf/profiles/76561199745887780#!/compare/1743984000/1744070400

But then there is also a removal of 65 pure randomly here?

https://backpack.tf/profiles/76561199745887780#!/compare/1747094400/1747267200 ~ 65 pure

Sale #4:

https://backpack.tf/profiles/76561199158211678#!/compare/1743552000/1743984000 ~ 26 ref matches

https://backpack.tf/profiles/76561199674417290#!/compare/1743897600/1743984000

Sale #5:

https://backpack.tf/profiles/76561199581722058#!/compare/1739750400/1739836800 ~ 66 pure matches

https://backpack.tf/profiles/76561199158211678#!/compare/1739750400/1739836800 ~ 66 leaves

Sale #6:

https://backpack.tf/profiles/76561199766431015#!/compare/1739750400/1739836800 ~ 81 keys match, must have been dumped with other items

https://backpack.tf/profiles/76561199581722058#!/compare/1739750400/1739836800

Sale #7:

https://backpack.tf/profiles/76561198453530349#!/compare/1738540800/1739836800 ~ ?

https://backpack.tf/profiles/76561199766431015#!/compare/1739750400/1739836800 ~ ?

Considering sale #1, #2, ended up being tradebacks, ignoring them. Sale #3 is bulk as obtained with 5 or so other unusuals.

So taking 66 keys.