I started working on the clues near June 22nd or so but kept the box as unavailable until in July I had completed the clues.

You should have listed it as a reserved box. As soon as you converted it into a traditional box, it would have shown up as a "newest" letterbox.

Be that as it may, your box already showed up as a new listing the day you listed your box. Just because it was unavailable didn't make it any less of a new listing. In theory, everyone would have already seen your listing--no reason to force them to see it again.

-- Ryan

Thanks, Ryan. I wondered how to work on a clue without it being listed right away.