There was nothing special, the keychain was 15 yrs old. Keys were to house, mailbox and car itself.
I did an experiment with my only left keys..I put them on the top of the same car the same way and drove the same route. I expected them to drop in less than 2 minutes, but they did not, and from the way they looked on the top of the roof I think they dropped somewhere on Carmel Valley road. Or worse– on freeway.