Something probably was up, but I wouldn't lose too much sleep over it. You should be fine.
Taking things a step further, your story got me thinking about the "risks" of accepting to take a photo for a stranger. Perp 1 hands you a stolen phone to snap photos; perp 2 walks by and 'accidently' bumps into you, phone drops and gets damaged. Now Perp 1 is bugging you for some cash... it's pretty easy to go down the path of don't trust anybody
