I don't think that most requests show up on your confirmation letter. The only request that does (as far as I know) is smoking preference. Call MS and ask to verify your preferences. I'm betting that your request for a Boardwalk view is noted in the computer. If not, you can add it then. FWIW, my understanding is that the requests are honored in the order the reservation was made, not when the requests were made. Of course some things like medical necessities take precedence.
Good luck - hope you get the BW view you want.