Nope, no VIN on 1968 bodies.
I emailed a pal about the numbers since 1968 is not a year I know much about. He decoded the numbers for you;
" G8 RI 30955
Coronet and Belvedere models were built there all year. Chargers were added about April from what I can tell.
G= STL
8=model year
R= Belvedere line (X would be Charger and W would be Coronet)
I30955 = SO number 130955 "