It's not anywhere visible that's for sure. My 1st went into the toilet and after taking out the screws and prying on it--I gave up and put it back together after the volume rocker-button fell out and the USB slider came undone. Didn't feel like destroying it figuring out how to get it separated.
lol was just looking for it myself... the battery one didn't change after it my phone went in the toilet but the touch part of the screen isn't registering.. oddly enough the capacative buttons still work.
on the epic it is hidden inside of the phone, asc locations have been instructed not to take these phones apart yet as they require a jig to reassemble. This means that you probably won't be able to put the phone back together in the event that you do find the paper, also there are other ways you can notice water damage if you already have the phone that far apart.