Depends on your definition of long, long time ago. I've also wanted to look up older items (or find a seller I thought I had purchased from before). You can go back as far as 2021. If you go to My Ebay Summary, click "Purchases" then on far right there will be drop down that shows: Last 60 Days, 2023, 2022 and 2021.
If it's been the last few years you should find it there. Also make sure if you have ever used "hide my orders" that show hidden is chosen.
This can only be done on deckstop/laptop version not the app. Hope this helps.