In some cases, yes.

Y16 cars were built through out the year, so some sat while others got delivered right away if there was a 'match'.

Some original owners have reported that the car they 'ordered' showed up at the dealership with one or two items not right. Exact car, but without a radio when they ordered one, that kind of thing.

If they had a close match already built, they would send it.

I have seen a few 'customer ordered' cars that have Y16 on the broadcast sheet.