they've corroborated that he owned a fishing rod which was disposed of. even assuming the codes were stored there he could have 10 other copies of the same in

they've corroborated that he owned a fishing rod which was disposed of. even assuming the codes were stored there he could have 10 other copies of the same in other places and how would anybody know. they could be encoded in a simple way to make them unrecognisable and unusable to anybody but him.