Be sure to put your name and arrival date on the package so the Bell staff can store and locate it for you. They wil usually notate the package on your reservation in the computer and it will be mentioned when you check in - but if not just ask and they can track it down for you.
If you have a lock-off 2BR you will already have 2 pack-n-plays in the villa. If you have a 1BR or Studio just make the request at check-in - they are available on a first-come basis. (You may even want to call Housekeeping when you get into your villa).