I own a 15" rMBP (late 2013) model, while waiting for it to come back from the Genius Bar, I decided to buy myself the top model rMBP that's out right now. I got my original laptop back and I'm going to return the one I bought. HYPOTHETICALLY: a) What if I return the old rMPB? They look identical on the outside, internally they're different. I'm assuming Apple will be able to track me down based on serial number and credit card used and ask for the newer laptop back. b) What if I have bought my both rMBP with cash and returned the old one after wiping the drive? Will Apple have any way of tracking me down? technically there's no paper trail as long as I wipe my drive, I don't see any other way for them to track me down. Again this is all hypothetical, my friends and I were discussing this and we came to a conclusion that a) wouldn't work while b) would. What do you guys think?