Might anyone have a use for a partial sheet of plywood?  It measures 36” x 48” x 19/32”.  19/32” is a little more than ½” and a little less than 5/8”.  It’s in very good condition.  I used it as a stiffener between mattresses.  It is a little cupped.  It used to be covered by a bedsheet that was stapled on so there are many tiny staple holes on both sides of the piece; there are no staples or even pieces of staples still in the piece.