You should be able to see if the frame end nearest the dent suffered any damage as they have a pseudo crumple zone I believe - look at the shape compared to the other side, and if it's the same, don't worry about it. I've bought brand new vehicles with dented bumpers I've had the dealer replace before - the salespeople try and squeeze them into some really small (too small) spaces and sometimes that happens.
Curious - is your leather the aftermarket type, i.e. Katskinz (sp?), or did they actually put the factory leather seats in?