Boston, MA 02108-1608. Complete this affidavit and bring to an RMV Service Center with Certificate of Title and other required documents.A. Vehicle Information. An affidavit of loss is a document declaring the loss of a security usually through theft or destruction. Then personally appeared the above named. Subscribed and Sworn to before me,. This ___________day of. Pretty difficult to prove a negative. Massachusetts Affidavit Templates. Use our Affidavit template to swear to the truthfulness of a statement or fact.