I do something similar to this one but more low tech. When I get a new SD card I take a pic of a note card that has my name and cell phone number with a note saying please call if found.
This is a great idea! Also, when vacationing, I make sure to take a picture of the hotel and room number!
This came about after my sister lost her camera while we were on vacation. We were biking along a boardwalk, and we stopped to take pictures. While I was taking a picture of her, she set her camera down. Didn't pick it back up. Well, we looked everywhere trying to find it, but couldn't. We went back to the hotel. This guy and lady drive up to the hotel, knock on my sister's door, and hand her the camera. She burst into tears. They looked through the photos and found pictures my sister took of the hotel and of her family standing in front of the door, including the room number.

Love those people.