I see mention of a merchant seal in dust temple,listed as being near the portal yet i can't see it at all and have explored 100% of the dungeon. I've gotten the one in new borgtongo(or whatever it's called) and this is the only other one i can currently get without fighting ridiculously high level enemies. If anyone knows where to look i'd be thrilled.
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The seal is in a treasure chest, on the same level where you can find the portal fragment.
Keep in mind, there is a slight tolerance in the exploration display. It might already display 100% even if you haven't explored a few missing tiles, which is conveniant in most cases. Especially on very large maps or areas.