PRE Share Certificate, page-27

Contact the Post Office that supplies your old address, if it's been returned they may have it still sitting there while they decide what to with it, i.e. such as trying to track you down or returning it to sender. Contact your old address, if they haven't returned it to the PO they may still be sitting on it, etc. Big chunk of dough not to follow every avenue. GL.

PS - Newstead is right about the different SRN's.