Personally, I've never really thought C Masquerade Hint was the answer. Masquerade Hint doesn't make any sense to me. He has said that we don't need the book Masquerade to solve it.
If you're going to use HINT, why wouldn't you use the P and the L? Why wouldn't it be C Masquerade Plinth?
Since the numbers on the magic square lead you to: C Masquerade, then why wouldn't we follow that same system with the rest of the numbers, which would get you: c masquerade _IN _ _ _ _ _ H _ T _
Maybe the trick is to figure out what goes in the spaces to spell out a sentence.
And maybe we should toss the C out because it corresponds with the number 0. If he wanted us to keep it, why wouldn't C be 1 and M be 2, etc.?
"Hint came squared" is an interesting theory. I think the more letters you have to anagram, the more phrases you can come up with that might be nothing. I read that people were convinced Kit Williams didn't really hide the golden hare because his name anagrammed to I Will Mask It.
But on the other hand, I don't think it's random that the number of days is 4900 and they specifically mention the start and end date in the book.
Wasn't that "hint" in masquerade that when you did the magic squares there it then said No Hint Here (?) I could be remember wrong but often think maybe its a double red herring joke. Unless I'm remembering wrong. Maybe someone can help (?)