I have never bought pre owned. I'm hoping I am not expecting too much.
It depends on what you truly want deep down inside. If you really want a brand new, pristine bag - than that is probably what you should buy; but since you took the plunge and bought a used vintage bag, just give it a chance and see if it meets your needs and expectations.
I recently purchased a used Stewardess bag for $45 that was made in the US in 1999. I could have bought a brand new glove-tanned stewardess for $298 or one of the newly released light-weight stewardess bags for $350, but I am very happy with my $45 investment and I wear her often.
Below are 2 before and 2 after pics, she will never be pristine but I think she is beautiful. But if you are likely to feel that you've missed out by rehabbing a used bag, then they should buy a new bag. And keep in mind that all my rehab projects don't always come out as well as I would like; but since you bought a black glove-tanned bag - those usually have the best chance for success. Good luck!