Most users should use Affidavit of Domicile (MPC 485). If you need to save a partially filled-out form, you may choose to use the alternative form:.For a document to prove residence, it must state the residential address. A P.O. Box is not an acceptable proof of residency. Proof of residency includes a government issued ID (driver's license, passport; military ID) with your current address on the ID. I need 2 documents to prove my residency to get a real ID. Use our Affidavit of Domicile form to verify the last home address of a deceased person to speed up the inheritance process. An official Proof of Residency (POR) letter is a document that can be used to serve as proof of residency in the City of Springfield. Establishing residency in Massachusetts often requires official documentation.