You're in an awkward situation here in that neither Florida nor Federal law has any mandates about when the final check can be released. A company handbook, whether it is signed or not, is rarely a legal document so it's kind of immaterial whether it was signed, unsigned, or even in existence. In your case, it doesn't really matter; your signing the handbook is not permission for them to do something or an obligation on your part to do something; it is an acknowledgement of the policies contained therein.
How much time are we talking about, at least in estimation, here? It makes a difference what I recommend you do next.

