I wouldn't think the USCIS office is closed all week... holiday week, so not sure what this means. I would give it another day before getting too drastic. I have no idea what is meant by STAMP either! What does that have to do with USCIS centers? If you have mail delivery confirmation from USPS, that should be good enough. Would think they will be open for business on Wed, but after that, they will likely be closed, but not sure about Friday. I wouldn't send another complete package yet! 171089[/snapback] With "Return Receipt", you need somone to sign. If it's an un-manned post office box, it may get returned.