Perma Plate - black interior residue

My friend has a 2006 Acura TL and the Perma Plate was put on it when he got it. The interior of the vehicle now has a black residue - mostly in the back seat area. It looks like black magnetic flakes. It does not wipe off easily. It is on all surfaces (leather interior, interior roof cloth, door handles, etc.) - if it isn't metal, it has this residue on it. The dealer claims to have never seen it before. It it terrible! Anyone know anything about this?