Assuming the customer really cannot give you anything to validate the address, send him to the license branch to get a corrected license - he is going to have to go anyway.
I don't know about other states, but California does NOT issue a new Drivers License just because you have moved. These are the instructions from California DMV (really handy for those folks who have moved due to eviction/foreclosure...)
How to notify DMV when I change my address
Law states that you must notify DMV within 10 days of changing your address. There is no charge to change your address, and you may notify DMV by any of the following ways:
Complete your change of address online.
Call any DMV office at 1 (800) 777-0133 and request that a change of address form be mailed to you. It will take 5 days for you to receive it. Complete the information required on the form, then mail it to the address listed at the top of the form.
Download the Change of Address form DMV 14, complete the information, and mail it to the address listed at the top of the form.
Visit any DMV office, complete a change of address form, and give it to a technician. The technician will give you a Change of Address Certificate card (DL 43) to complete and carry with your license.
If you do 2 or 3 above, type or write in ink your new address on a small piece of paper, sign and date it. Carry this piece of paper with your license. Do not tape or staple the change of address information to your driver license.Yeah - so basically your new address is written on a piece of paper that you get to carry with your license. Whup-de-doo!
I remember my sister having problems when she bought her very first new car. She shared an apartment with 3 other roommates, the lease and utilities were not in her name. The address was different than the one on her license because she moved about 6 months after her license was renewed. All of her mail (paycheck, bank account, etc.) went to a Post Office box because she had experienced problems about a year earlier with a former room mate who stole her mail.
She finally wound up getting her employer to issue a duplicate paystub with her new address so that the dealer loan would finally go through now that she had "proof" of her address.
I'm not sure that our banking system or country is any safer because an employer had to rig up a duplicate paystub so their employee could get a vehicle to get to work. (The engine in my sister's previous car went kablooey - and in Southern California, if you don't have a car, you probably ain't getting to work!)