It was only one sale out of like 5-6.

https://backpack.tf/item/7955738188 (This one cannot be used due to Scrap sales)

https://backpack.tf/item/5473013740 (This one also cannot be used due to it not selling on Marketplace quite yet, also hi Geel!)

Link to MP --> https://marketplace.tf/items/tf2/601;5;u57

https://backpack.tf/item/2942555430 (This one is the source of most sales, you'll be needing to use this one mainly)

https://backpack.tf/item/2564517169 (Duplicated hat, you're using clean sales so I think it's fine to exclude this history)

https://backpack.tf/item/2201657359 (Also duplicated, probably fine to exclude)

Now, I'd highly recommend getting Julia's and the other scripts listed in the Pinned Messages on the Backpack.tf Discord in #suggestion-discussion.

For your sake though, I'll copy pasterino what Erik posted there.

Full list of all Suggestion scripts

If you're using Google Chrome, make sure you install Tampermonkey first in order to download the scripts. After you installed the scripts (this should all be fairly easy and automated) refresh the page or restart chrome in order for it to work.

Premium Recent Sales Finder

Quick Premium Histories

Quick Marketplace Value into Key Converter

Quick Browse Through Trading Inventory

Bot.tf Stat Page

Make SURE you have Tampermonkey installed for Chrome or Firefox if you're using it, there's such thing as Tampermonkey for Firefox now :P

Anyway, go through those histories and list all the sales, make sure to come to the backpack.tf Discord for help!