As usual, games fail to take into account the fact that I hid the macguffin rather than bring it to the final dungeon with me. (And I'm sure I'm not the only one, in a game with an encumbrance system.)
Now there's a plotline for a fantasy story... You're a piddly little low-level sneak thief scrounging a living, and to your vast surprise stumble across a ludicrously powerful artifact in an unlocked drawer in a tumbledown shack, stashed for safe-keeping where the Big Bad would never think to look for it. But how do you profit by this? If you *tried* to reach the Big Bad to sell it to em, you'd get killed. And somebody powerful probably knows it was here and might come looking for it... But it's the score of a lifetime, you can't pass it up!