Well, I'm not privy to the realities of law enforcement to know how far anyone will get, but per Florida's website (had to do some digging), here's legally where this theft would fall:
"(c) It is grand theft of the third degree and a felony of the third degree, punishable as provided in s.
775.082, s.
775.083, or s.
775.084, if the property stolen is:
1. Valued at $300 or more, but less than $5,000.
2. ..."
So, this would definitely be a felony charge. That said, I echo some of the questions that others had raised, in that I don't understand how the CMs thought that the thief got into the room? The response above indicates that they thought that someone made a duplicate key for the safe, which sure, I could see. But how would a non-CM get into the room in the first place without forcing their way in? Something smells fishy with this - I would have totally pushed things further (and still would) - having money stolen from a hotel room safe while the room is locked and the safe is locked is totally unacceptable. Even if you couldn't get the money back and the thief couldn't be found, I'm sure Disney would have done something eventually to smooth things over...