Going forward you should be aware that some states are aggressively looking for additional revenue. Some states are now going over federal returns looking for people with mailing addresses in their state who didn't file as a resident. With no other supporting data they are then sending out demand letters saying "we think you are a resident so refile your taxes and pay us $X plus interest and fees." I would highly avoid using any mailing address that isn't in the same state or country as your residence as it could send up a red flag.
For all the "it's just your mailing address" help you may see online, I can personally tell you it took me $3500 in lawyer fees and 6 months to fight off an aggressive state where I bought a second home and had hoped to retire one day. Starting to rethink that now.
