Dan,
I can not speak to the legality of the issue.
Registering a proxy statement is the process of identifying an individual to act in your place at a meeting and to cast a vote either as they think is best (a general proxy) or in a specific manner (a directed proxy). Proxy statements are not required to be on any specific form (unless your governing documents call for one). However, many Associations publish one to make it easier for the membership.
If a proxy statement is not returned, with a signature, the member did not authorize anyone to cast a vote in their place. Therefore, no ballot can be cast. Therefore, that statement should not be on a proxy statement. If the Association can not produce a sign-in sheet or signed proxies that can be matched to the number of ballots cast, they would probably lose any legal challenge to the validation of the election.
To legally challenge an election you would typically need to go to court.
For more information on Florida Proxy laws:
For Condominiums -
Click here and scroll down to 718.112 Bylaws, b) Quorum; voting requirements; proxies. For HOAs -
Click here and scroll down to 720.306 (8) PROXY VOTING Tim