I moved a couple years ago and I believe my state law gives 60 or 90 days to do a change of address on licenses. My new address was different than my shipping address because 90% of my small town, including me, has P.O. boxes. And I hate having packages shipped to the P.O. box because packages don't typically fit the box. So you have to pick up the package during "business hours" even though you can access the P.O. boxes 24/7. The problem gets worse because my post office has shortened business hours and closes 2-3 hours before most people get off work. So I have packages mailed/shipped to my parents' house. UPS won't even deliver to my house, they drop everything off at the post office. And until I changed my license it had my old address, then I had my new address, a P.O. box for normal mail, and a shipping address for packages.
Long story short, just because someone has 2, or more, addresses does not mean they're not honest.
My biggest concern would be whether or not Maryland allows online ammo purchases and if there are any legal stipulations that they put on such purchases. It's not really a gun friendly state.