Looks great! You did an excellent job and in a very short turn around, just how I want to do mine.
As for the chrome around the back, that was more than likely factory. How do I know? One way to know for sure is, if the plastic retainer clips went over a "stud" or if they were pop riveted on. If they had the little mushroom stud, those are welded on and no dealer body shop has the ability to do that as far as I know.
Reason I sound so sure is way back in the late 80's I was writing for Mopar Collector's Guide and was researching a story. I ran into a guy(not literally) that had worked at the St Louis assembly plant from 1960 to that present day, I'm sure he's long retired now, but he was filled with first hand knowledge of these B bodies. He told me mistakes were made all the time, think about it, these were blue collar union workers in the 60's. Their were some that took their job seriously and just as many that didn't. so those rear chrome moldings could have been factory installed as the guy putting those studs on may have put them on every car he did that day or that week before someone noticed and stopped him.
A other anecdote and I'll stop mucking your thread up, he gave me an example of one guy who was in the undercoat pit. He NEVER read the build sheet hanging from the kmember that told the pit guys which under chassis parts were to be installed. He gave every car that came through on his shift total undercoating, whether spec'd for it or not. Another guy that was vacation relief would do the opposite, he'd only spray the minimum that was spec'd for cars without the full undercoating option. I have lots more but this should give you an idea.
Again, your car and the job you did are amazing.