Our subdivision is still being built and in the first year living here, I had more flats than I had in the prior 30 years. I find (and pick up) a lot of nails and screws on my rides but the only two potentially valuable things I've found were a car remote with key (still unclaimed despite my advertising it) and a Bible in a case. The Bible had the owner's name embossed and even though he doesn't live in our sub-division, I advertised it and someone recognized his name and we got it back to him.