The dolly they used was just the regular two-wheeled manual type that wouldn't have a delicate part like this.
There were no children here so it's not a toy. Also, when I pulled out the old refrigerator to clean the floor, there was nothing there at all so I know it appeared there when the delivery guys installed the refrigerator It was laying under the refrigerator and to it's left side (looking from the front) when I pulled it out to install the water line. Really weird! I doubt if has anything to do with it but my ice maker still hasn't filled with water. The water is on and there is pressure in the line. Maybe it just has to run through a couple cycles to purge air out of the line (?). The freezer was at it's working temperature when I hooked up the line so it's not that the freezer isn't cold enough. The ice maker switch is turned on too. I'm guessing I will see ice by tomorrow.
The part seems to be some sort of little timer. It winds up like a watch and then spins the little cam and pulley when released. Maybe it just fell out of one of the delivery guys' pockets.
This reminds me of an old trick my father pulled on me when I was a kid. I rebuilt my motorcycle engine completely and, when I was done, I found a bearing left on the workbench. It drove me nuts! Years later I found out that my father put it there as a joke. It's an old trick but I hadn't heard of it at the time. I wonder if the delivery guys have a sense of humor like my father's! :-)
It's a gigi.
LOL! That's it! It's the inverse timer for the sequential gonculator circuit of the gigi!