I realize Brent, the OP, is from South Carolina, and the answer he's looking for will be found somewhere in that state's laws.
In Florida that proxy, if it's filled out correctly, is valid. Have a look at this Petition for Arbitration,
Case No. 2009-01-2882, heard by a Florida DBPR arbitrator. The issues are not exactly the same but the reasoning and logic behind the decision spring from the same statutes where the validity of proxies is concerned. In particular, have a look at pages 8 and 9 where this Final Order says:
"Respondent argues that proxies must be verified in order to avoid fraud, and that the legislature has only provided minimum requirements for the form of proxies.
On the contrary, the legislature specified requirements for a proxy âto be validâ, including detailed information, the date signed and signature of the person executing the proxy, and it set limits on the use of the proxy.
Use of such a proxy is not merely an option but a ârightâ, unless otherwise provided by the legislature or governing documents. The only choice for an association is to amend the documents to prohibit proxies or to accept proxies executed according to the legislated instructions.
A homeownersâ association may not impose rules or limits on a proxy the legislature has already declared to be valid.
Although the requirement for verification may seem attractive to avoid fraud, the legislature chose not to limit homeowners with such a requirement."
(emphasis added)
No other statute or governing document gives anyone the power to declare themself "Protector of Rights". Busybody boards and board members need to step off their soapboxes and follow the law. Which, again, is certainly going to be different in South Carolina than it is in FL. A proxy can be rejected if it appears defective (the board does not get to define "defective"). Otherwise, you have no choice but to accept it.