As a postscript to the most recent post, I'm happy (I think) to say that my lost phone is now back in its owner's possession.
I had thought I'd looked everywhere and traced all my actions since the last time I had the phone in my hand, but I forgot something. We went out to dinner last Thursday evening and sat in a booth. My purse was sitting beside me, along with my coat and scarf. At some point I rooted through the pile next to me to get something from my purse. It wasn't the phone, but I'm guessing the phone thought this would be as good an opportunity as any to make its escape. And escape it did. I didn't notice it sitting there, despite its shocking pink color.
When I finally came to my senses and called the restaurant, I was happy to hear, "Yep. We've got it!" So all is well, except...I was going to use my lost phone as an excuse to go shopping for a newer and better one. Maybe I'll do that anyway. In the meantime, I'd better get all those stored phone numbers transferred to my computer before my errant Razr phone decides to get into trouble again.