I understand someones first reaction on this subject, but.... it is for a monitary reason.I would knee jerk the same way I suppose if someone found a shoe box filled my my most expensive chip.BUT,it may not have the impact on the price that you think.
Think of the condition of the other ashtrays and other reasons.
After a time I would decide to have fun selling them and telling my story.Or they could just go back in the attic.I would not,could not, destroy them. 'nuff said. Rick R-3113