This should be a better version of my previous suggestion, mainly becuase of the fact that man with the bird (https://backpack.tf/u/76561198823301766) helped me with the compare function.

Here is the item history. https://backpack.tf/item/5209455206

Here is the proof of my trade for 200 keys pure. https://imgur.com/a/zEQYkqu

The info below was provided to me by man with the bird. These are the previous trades.

Trade 1:

https://backpack.tf/profiles/76561198034483447#!/compare/1646092800/1646179200

https://backpack.tf/profiles/76561199084784906#!/compare/1646092800/1646179200

Seems to have been a bulk sale, so no tracing there.

Trade 2:

https://backpack.tf/profiles/76561199084784906#!/compare/1647129600/1647216000

https://backpack.tf/profiles/76561198119624879#!/compare/1647129600/1647216000

Sale for 136 keys + buncha sweets, probably to top off to ~140 keys.

Trade 3:

https://backpack.tf/profiles/76561198119624879#!/compare/1647734400/1647993600

https://backpack.tf/profiles/76561198194263363#!/compare/1647907200/1647993600

Downgrade to a non-strange one + another 1 or 2 unusuals.

Sorry that the last suggestion was kinda bad, it was my first one ever, so I didn't really know how to do everything properly.