[Starless]

So over the past year or so I'v been selling of all my photo equipment that I'v accumulated over the last 45 years or so. I just came across an old Exakta camera that the owner had engraved their Social Security number on the body and on the lens. I'm pretty sure this person has passed away by now, but should i somehow take a dremill or some other grinding devise and grind it off or sell it as is? I don't feel comfortable letting somebody get this SS number even if the person has passed. What would you do?