Well, since you already paid for the thing and there's not typically a huge window of time to return it, the answer to your stated question, according to the Serenity Prayer, is to accept with serenity the things you cannot change.
What you may also be asking however, is "is there a legitimate reason to have so many miles on a car that hasn't been owned before?"
It could have been from moving cars from dealer to dealer, but in my somewhat limited experience that happens on a car hauler-- especially if we're talking about another lot 3+ hours away, unless you live absolutely in the middle of nowhere.
The miles aren't high enough for it to have been a "demo car" that a dealership employee uses, so my guess would be that someone took it for an extended test drive, like over a weekend.
Another thing that would sometimes add miles is the pre-delivery inspection, but we're looking at maybe one or two miles.