We travelled there in 2008 and stayed in paid accomodation for about 4 out of 25 nights. We kept our receipts for the paid accomodation incase some official wanted proof or anything like that. I don't actually remember registering, but do remember receiveing a receipt (possibly registration slip) of some sort from the places we stayed at which we kept too until we left the country.
I wouldn't worry about it too much...just make sure you keep receipts and other paperwork from places you stayed at.
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