-Indeed, a very unusual case. As for the theft itself, as far as I understand, you haven't found any other clues or leads besides the envelope, which means our only option now is to play by the thief's rules? Don't get me wrong, I highly doubt that every street hustler could steal works of art of such great value, and dealing with a maniac who wants to play his own games doesn't appeal to me much. However, we really don't have much of a choice. If we manage to save at least part of the collection, that will already be a certain success.
What do you think, Hero? And should we take on this quest?