Wow Liz (Lollipop's Mom) I just read the whole thread and great job! Nice to know you would go to all that trouble for a complete stranger. I hope if I ever find one I would do something like you did.
Few years back I left my dig cam. in my rental car. Long story short by the time I was able to report it (after I got home from flight) the van was already gone for 14 days. I kept calling and it was never found.

All I really wanted back was my card. I'm sure one of the car companies employees took it (probably someone like the postal worker you dealt with, I mean seriously? Dig. Cards are really cheap now). I wish someone had done for me what you did for that family.
I did find a website
www.ifoundyourcamera.com where people can post pictures from cameras or cards they have found. They have successfully reunited some people with their pictures. If you've lost a camera, or a card, check it out, maybe someone found it. Couldn't hurt.
I take a picture of my name, cel phone, and email address on each of my cards. I also make sure to put my name, etc. in each item I carry (on vacation) just in case. A few years ago it was how Delta got a hold of me about the camera bag I left on the plane on the way to WDW. Luckily the camera wasn't in the bag (they lady on the phone was so happy to hear that!) only extra batteries, cards, etc. but I was very happy to get it back!.
When I get a Photopass Card at DLR or WDW I take a picture with my phone or camera of the back of the card. I usually write my cel phone on it as well.
Speaking of losing things at DLR. Here's a hint for those of you with tickets at DLR. Write your name and phone number (don't write over the numbers or scan code) on your park tickets. I can't tell you how many tickets I have picked up over the years without any information on them. Some of them were 3 day PH. I''ve turned them into GS but who knows if they were every returned. BE SAFE, MARK YOUR TICKETS and TAKE A PICTURE of the back of the card (showing the numbers). Even if it's just a one day ticket you need one to get FP.
I did lose my camera battery on Matterhorn one day. It just fell out of the camera and I didn't notice until I went to take a picture and the camera was dead. The battery compartment was empty! Luckily I had another battery with me so I was able to see the last pix I took to backtrack where I had lost it. Went through the exit of Matterhorn and showed the CM my other battery (small black rectangle) and asked if anyone had found one in the last 1/2 hour. He had it! Yeah! As soon as I got home I printed out labels with my name and phone number and put it on all my batteries. They are pretty expensive. Which reminds me, I have a different camera now and I'm going to put a label on it as soon as I post this with my name and number.
I have also found cameras and phones at DLR. Last phone I found I called "DAD" on the phone and told him I had his kids phone. I was able to meet up with him later in the day (on a school trip) and return his phone. He offered me $5, I refused. I know I could have turned it in (and I would have if I couldn't find him) but a few years ago my DM lost her phone at DLR and didn't notice until the next day. She called DLR and they had it. They mailed it to her but they didn't call her to report they had found it. I think they find so many phones, cameras, etc. that they don't have time to track down the owners. So that's why I did it myself. I figured the owner would get it back faster if I contacted him. And it worked.
Once again, great story! Just another reason I love going on these boards. It's amazing what strangers will do to help other strangers.