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FL does not have probate records online only minimal documents which would not give you the information you are seeking as the will would not be online. I am afraid that you are going to have to get someone to go to the probate court clerk to look in the file physically, which is where any will would be filed, or you have to call the clerk at the Pasco County Probate court (http://www.pascoclerk.com/public-courts-svcs-info.asp) and ask them to look in the probate record for a will.
Unfortunately, aside from the will being filed in the probate court, FL does not register wills prior to probate, so the will would not just be on file somewhere I am afraid. If you knew your father's attorney, you could contact the attorney as they usually maintain a copy of their client's wills.
Also, the FL probate court requires an attorney to file any probate by the FL Probate Code.
If the will cannot be located through his attorney or in a safe deposit box or in his personal belongings I am afraid it would not just be registered someplace other than probate court when probate is opened and not before.
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