MacBook Pro :: Possible To Exchange A Store Bought 13" MBP By Mail

I bought a 13" 2.53 GHz Macbook Pro on June 15. I exchanged it for a new one on June 25th because the graphics would randomly distort. I didn't have the box for the first one so I did a laptop for laptop direct exchange.I noticed two small dents on the bottom right corner on the bottom case a few days ago and took it to the Apple Store to exchange again (still within 14 days) because I am certain that I did not cause them. The laptop has been sitting on my desk or in a padded sleeve in a padded laptop compartment. he store manager at the Apple store was incredibly rude. He kept stating that the laptop could not have left the box with the two dents. I mentioned getting a laptop for laptop exchange and he again said there was no way it would've left the box like that. He was also incredibly surprised that I just noticed the dents. I don't do anything that needs the laptop to have the bottom case facing up.