And the award goes to ...
vincir!

On Jan. 20, vincir anagrammed the author's AP clue, HINT: TACKLE REPOSITORYS, into CRYSTAL POOK IS THIRTEEN. This was confirmed by author in People Magazine and on atreasuretrove.com on Feb. 18. Official confirmation: http://www.atreasurestrove.com/Publi...lues/index.cfm

original Q4T thread:

Posted by: vincir
Re: New Clue "Tackle repositorys."
« Reply #18 on: January 20th, 2005, 1:59pm »

Take the whole of it all and anagram it:
HINT: TACKLE REPOSITORYS

CRYSTAL POOK IS THIRTEEN
So "there are thirteen" after all