May a party challenge the authenticity of a signature on an eFiled document?

Yes. A non-filing signatory or party who disputes the authenticity of an electronically filed document with a non-attorney signature, or the authenticity of the signature on that document; or the authenticity of an electronically filed document containing multiple signatures, or the authenticity of the signatures themselves, must file an objection to the document within fourteen (14) days of service of the document.