MI #7:
1-2: Randomly move one treasure from this island to another wild island.
3-4: No effect.
5-6: After exploring this island, place a treasure coin from your collection with value equal to or less than one you took on the island.
What is meant by “one you took”? I think it to refers to a coin loaded by the ship during the explore action and doesn’t seem like it can be used with UPS and other treasure trading abilities, because traded treasures are not actually being taken. Additionally, the rules for Explore action uses the word “take”, so I imagine the wording of this effect is specifically referring to the rules of the action.
It’s based on whatever non-unique treasures your ship loaded and still had on board when the explore action ended, whether they came from the island originally or were swapped in by some other ability during the action. Treasures sent elsewhere and not loaded by the ship doing the exploring do not count toward the effect.