I've had the out of bounds remote twice now. Both times I was able to retrieve it. It can take several tries.
Try with a child, since they can get closer to the edge.
Make sure the circle under the peep touches the remote with it's bottom edge. That's how I was able to get it both times.
I was in windowed mode both times, so I don't think it needs to be in full screen mode.
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Runners... never enough runners....