The enclosure letter should be designed to serve those persons as well. This transfer is due to a change of ownership. Sincerely,.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. Enclosures. An enclosure can prevent a letter from becoming too detailed. Enclosure C provides a short description of how Section 611 funds were allocated and how those funds can be used. This notice serves to request documentation for the post-payment medical review of Medicare Part B claim(s) listed in the enclosure. Do you need a Release or Waiver Agreement Form in Illinois? Create, print or download your Illinois Release or Waiver Agreement form for free. The text within these letters should be individualized for each child and family. 5.6 Sample Notice to Creditors.