About 2 years ago, I bought a Rocket League disc that was the legendary edition. The legendary edition came with all the bat mobiles and other stuff. I just noticed that I don't have the bat mobiles anymore. I remember seeing them a couple of months ago before Epic Games bought Rocket League.
I also decided to buy the digital version of the game because it was free, so I didn't have to use my disc. None of my items I had were gone except the bat mobiles.
I don't know if Epic Games took them away or I need the disc to get them back.
Best Answer
If you haven't already, you probably need to link your old account and Epic account.
You can set your preferred/primary platform and share inventory and progress across your accounts.
You should be able to see your old inventory if you synced the correct account(s).
Note: You now need an Epic Games account to play Rocket League