RBM wrote:

He bought an inexpensive item. It will be his responsibility to pay
to ship it back, and probably not worth the money or effort.

Unfortunately, that is the situation. It was a $12 item which cost me $6.00
to have shipped to me, and would cost me another $6.00 to ship it back.

The seller was careful not to describe the item as being tested by him, only
describing the item as being "fully functional" from a "working service".

If this actually had been a circuit breaker (and not just a switch, aka
"non-auto breaker"), I would return it for replacement, but as it is, I'll
just write it off.

Jon