Since the original question has no good answers- just a few spammy answers and one guess, the other two can't be closed as dupes. People have already commented with links, but what else should be done?
Leaving the questions open is the obvious answer but just feels wrong. There is no reason why the duplicates should ever be answered- we should focus on getting the original answered.
Closing as another reason is possible but, again, feels like a poor and clumsy solution.
Finally, it'd be possible to upvote the guess from the original simply so the dupes can be closed as such. This feels extremely dishonest however.