Macdrone said:

It's a button off the fanny pack cooler. It's the fan deal that sits on the top to pull air out of the machine.

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Bingo!  It also came with a System Saver (that I promptly forgot about).  The system also came with 10 or 20 original Apple blank floppy disks that are used and have software on them.  I'll have to check that out this evening.  To 3583Bytes point, I'll see what'd there.