They would probably be okay to delete then as they are self-generated (by something you installed) rather than put there by DreamHost.
I would still be inclined to put a ticket in just to check. DreamHost do not mind how many tickets you submit.
Obviously you are in no rush so the short wait for the response would be worth it in the long run.
Opinions are my own views, not DreamHosts'.
I am NOT a DreamHost employee OK!! :@
You act on my advice at your own risk!