The Museum thread
Maybe, although that's likely to just get the thing seized, not just because of the fraud but because it's of interest to the authorities for its message. And any resolution would require the swift (bureaucratic) hand of justice to do its work, so it might be done in a year or three.
If giving the museum and pawn shop (especially the latter) a poke in the eye is more important than getting the amulet back quickly, though, then it's a viable plan.