AppleCare took the wrong iPhone serial number

I dropped my iPhone 4S in the toilet yesterday - bummer. Fortunately I purchased AppleCare+ when I first bought the phone. Today I called up AppleCare, told them what happened and asked what my options were. I decided to spend the $49 for a send in service/replacement. They told me to go to a UPS store and they would send it to Apple, Apple would look at it, and I'd recieve a replacement phone in about a week. So I took my iPhone to the UPS store, they took my repair ID and printed me out a sheet with the product information on it. The problem is, when I got back home I realized that the serial number on the sheet was my mother's iPhone serial number, not mine which I just shipped to Apple. So now what? Will Apple "deny" the replacement due to the serial numbers not matching up? Should I call AppleCare and inform them?