That's what I thought.  See my "edited to add" update of just a few minutes ago.

That's three strikes against the MiBox, so it looks like it may be going back to the store.  Too bad.

Btw: If you still want to try it: The GE/Jasco remote is inexpensive: Only $9 at the local Walmart.

ETA: And, if that fails, the situation may be salvageable with a FLIRC: [Link: howtogeek.com]

I've posted a question about the MX-500, MiBox and Flirc over in their forums.