§  19.21  Stolen property.  The provisions of sections 19.17 and 19.18  of this article shall not apply to any property that has  been  reported  as  stolen  to  a law enforcement agency or to the Art Theft Archives of  the  International  Foundation  for  Art  Research,  or  any successor  foundation  or  agency  having  similar purposes, no later than one year  following the theft or discovery of the theft.