While I have not done one of these no-stays in years, and it is probably not necessary to do this, I actually open the door and kick the sheets around a bit to make it look like I have stayed in the bed. Others have posted about doing this in the past, too. It's probably overkill, but if you are already at the hotel anyway... Some people have reported being able to check in without actually ever going to the hotel, but technically you shouldn't get points and you have no recourse if you pay for the room and are not given the points when you do not show up.