In case you haven't heard yet, and this deserves a signal boost, sealed product for Eldritch Moon has proven to be extremely searchable. That is to say, there is an easily identifiable pattern that will allow you to easily determine which sealed boosters contain the non-flip mythic rares. They tend to all be in the same booster art in a given box.
I imagine that the overwhelming majority of QS readers don't mess with loose packs anyhow, though it's likely that you know somebody who does. Letting them know to stay away from loose Eldritch Moon packs, or at least to exercise caution would be good of you. It's naive to assume that nobody is going to exploit this easy mapping technique, though hopefully spreading awareness will help to prevent them from taking advantage of anybody.