How can I find out if my TTA is a festival car?

[brn agn]

From what I have read, there were 187 T-top/Cloth TTA cars built and 168 were used at Indy. How can I find out if my car was used at Indy? I have documentation from PHS and it does not mention this. What is strange is that I called the original owner of my car to see if he still had the decals and owner's kit, and he told me that when he bought it from the dealership, these items were not included (?). Does anyone have a list of VIN's for the cars used at Indy? Any advice would be greatly appreciated!