That K3H- serial number prefix is something we've talked about here a lot. Opinions range from Possibly to Almost certainly fake. I see other problems with that bag too - the stitching on the leather top zipper pull is really uneven, the pipiing around the base seems much wider and thicker than it should be, the pair of grommets at the end of the top zipper in Photo # 8 are silver and not brass and it looks like there are breaks or seams in the piping on either side of the top zipper, and
Coach would NOT have been using solid brass buckles in 2003. I also don't remember that shade of pink being available in 2003, and that's awfully recent for a Maggie Duffle.
I doubt if that one's genuine, but wait for
Whateve to take a look. You'll have only a few days to file a SNAD claim.