When size, weight, or other factors prevent sending an enclosure with a letter, send it separately and type "(sep cover)" after the enclosure's description. Example Wording of Third Party Release Letter: "I (Your Name Goes Here), authorize the release of my vehicle a (Vehicle Description goes here)In this article, we explain what an enclosure is and how to cite one, and we provide an example of an enclosure in a business letter. Do you need a Release or Waiver Agreement Form in Arizona? Create, print or download your Arizona Release or Waiver Agreement form for free. Type a keyword or search term into the search box below to filter the list of forms (e.g. : plant, fire, setback, etc.): Search for. Add an enclosure notation after your signature at the end of the letter, and abbreviate it with "Enc." or "Encl. See Appendix 1 to this enclosure for a sample, optional format for use in documenting actions. Reports of inquiries and investigations, at a.