If your really unsure, ask the CL attendent if you need to fill it out or not. If there isn't an attendent (and usually there is one around) just call down to the front desk. If they give you the green light to go without filling out the slip, your OK to go. If not, then you know for sure.

Of course if your having a tough time getting up the nerve to ask someone at the hotel, then maybe that's your concience telling you what the answer is.