I've also heard that about the WC - that is blocked up and walled off, so no one can gain access to it anymore.
ST notes in his book (page 25) that Patsy was shown a second generation copy of the RN and remarks to one of her friends that it looks like it was written on the same paper she has in her kitchen. Police wondered how she could tell since they saw no similarities.
I believe John Ramsey himself handed the note pad to police when they asked. Police took at least two notepads, labeling one John and one Patsy (also from ST). They figured out it was Patsy's pad the RN came from by matching up the tear lines.
Check this out:
http://www.acandyrose.com/04112000thomas-pg73-74.htm
Steve Thomas book, "JonBenet, Inside the Ramsey murder investigation"
Quotes from Page 73-74
"Chet Ubowski at the CBI had pulled startling information from the tablet belonging to Patsy Ramsey. By comparing tear patterns, Ubowski had determined that the first twelve pages were missing and the next four - pages 13 through 16 - contained doodles and lists and some miscellaneous writing."
"But the next group of pages, 17 through 25, were also missing from the tablet. The following page, 26, was the practice ransom note (Mr. and Mrs. I), and that page showed evidence of ink bleedthrough from the missing page 25."
"Comparisons of the ragged tops of the ransom note pages with the remnants left in the tablet proved that it had come from pages 27, 28, and 29."
"Furthermore, the ink bleedthrough discovered on page 26 indicated that perhaps still another practice note could have been writtenon page 25 and been discarded. Two possible practice notes and one real one covering three pages led me to believe that the killer had spend more time in the house composing the ransom note than we originally thought."
"But even more significant, it seemed clear that whoever wrote it was unafraid of being caught in the house. We never found the missing pages."