The car has probably been registered and driven here in Indiana like that
for years.
The BMV here in Indiana doesn't look at vin plates or even your car.
State police out of state inspections prior to Indiana registering only checks for non matching title vin #s to vehicle vin plate #s.
Not incorrect vin plate to vehicle on old cars.
They do not concern themselves with ensuring you are registering a numbers
matching car in any way.
They are concerned about signatures being in the proper place, proving identity and collecting revenue during a title transfer.