Here is a sample letter that I made that they accepted yesterday when i submitted my application. These forms and instructions are available in the General Clerk's Office, Room 108, in the Nassau County.When a document has been e-filed, it is served on all participating parties and marked FILED with the Nassau County Clerk's Office. Learn how to format an email or hard copy letter with an attached document and review our examples to use as a guide. Step 1: Obtain and prepare application. Obtain your letters of testamentary in New York with ease. It is essential that all the information provided is accurate. Incorrect information can delay or nullify the application process. Sending documents to the U.S. Embassy in Nassau. Most forms may be filled out on your computer, printed and submitted for filing with the Department of State.