1965 A-body pilot car!

I have not seen any info about early abodies being test cars either. My assumption is they were crushed or sent to technical training programs. I also will assume because the chassis is so similar built that once a design was passed there was no need to look back.
Example 1964 model test mule was used for 65 and 66 changes. 67’ mile was used to test 68-69 changes.
Again opinion only- just seems logical.