Definitely-- but you have easier sailing, and a virtual lock, if you do that while you are still checked in.
Have not heard success stories of persons who join MR after departure and try to get stay credit for a stay where they checked out before being a member. They may exist, but I've not heard them.
Hi hikotheimer. You've gotten some great advice from our fellow Insiders, insertcoffee & ppezzano!! If you ever find you are missing a stay, feel free to reach out to one of the Community Managers, deannad, lindseyh, AndrewT, or myself. We would be happy to look into it for you and make sure all eligible credit is added to your account. Welcome to Insiders!!