Hi Lorraine,
Personally I would send anything important fully tracked. If you sent it signed for the postman told me that it is put in the sack with all the other ordinary mail and the only difference is that a signature is taken from the recipient. If the postal item is fully tracked it is separated from the ordinary mail and its barcode scanned at each point on its destination.
I have never heard before of a " holding site ".
David
Nothing on this board constitutes legal advice - always consult a professional about specific problems 
