In each such bond, the condition that the person elected or appointed shall faithfully perform the duties of the office shall be sufficient. The fact that the instrument is without a seal, that blanks like the date or amount have been filled subsequent to its execution but before its acceptance, without the consent of the sureties, that all the obligees named in the instrument have not signed it, that new duties have been imposed on the officers or that any merely formal objection exists shall not be available in any suit on the instrument.
(R.C. § 733.71) ('68 Code, § 2.8)