her visa exemption is two years and multi re-entry permits track with the visa exemption date. However since none of this offers any advice or direction I will remove my question.
It was not canceled. It was stamped used in error as if it was a single entry permit, not multiple re-entry as per my original post. As evidence that it was not canceled we have entered using the same valid multiple re-entry permit several times since the errant “Used” stamp was made. I am quite simply trying to stop the Q&A session at immigration that makes for a few minutes of unnecessary delay and explanation on entry.