I checked the properties on the pictures that were last uploaded from the memory card to figure out which day it was that I had last seen it. Eventually, the pieces fell together. On my 6th trip back into the guest room (aka my sewing & craft room), I remembered that my tape measure was the other item out of place in the office. Friday night, I had been negotiating the purchase of a portion of a wrap to make a ring sling. I was using the tape measure to determine just how much of the wrap I needed, since my linen ring sling was out in the car. On my way to my bedroom, I put the tape measure and the memory card in the guest room…a room off limits to the kids. The tape measure was sitting on top of the memory card, obscuring it from view.