So I reached into my wallet for my credit card today and lo! it was gone.
It has been a while since I've used it, and since I don't routinely thumb through my wallet to see if everything is in order, no reason to notice it wasn't there until I needed it.
There is always a moment of panic when such a thing happens: When did I last see it? Where was I? So I went round the local gas station and supermarket -- not that I use the card at the market, but I do use a membership card there that resides in my wallet and I could have maybe pulled out the one and dropped the other.
No love there, but I called Costco and indeed somebody had turned it in -- I dug the Costco card out and apparently dropped the MasterCard. Costco didn't call -- why I don't know -- but instead held it for two weeks and then destroyed the card.
On the good side, that means nobody was out charging trips to Thailand on my plastic; on the bad side, it means I have to apply for a replacement, and will be paying cash for gasoline, for which I won't get that little rebate, until the card arrives.
Never a dull moment.