Save file issues

I had been gifted all of the unicorn cars back in the day and do not want to lose them, all of the vehicles on my save file in my full garage show a black box X999 class and I have no clue what to do I can’t find any specific cars anymore and I had a lot of specifically tuned cars with time-consuming liveries and such this is really annoying but I have tried quite a lot to fix it if anyone has a new suggestion for me that’s the purpose of the post I have even fixed corrupted hexadecimal in the file where the image data is and the save still does not display cars making a new save on a USB drive works fine as expected.