FYI, several years ago, I had to send in a check to the RMV to renew my license and the renewal never came, even though they cashed the check (you can get photos of the cashed check either on the RMV web site or your bank's web site). I tried to call the RMV multiple times which was utterly pointless, so I went to one of their locations and showed them printouts of my payment after which they gave me my new license on the spot.