No way can you borrow the metal from Sprott , to short it or deliver against other shorts…please can you check what you are saying….I am with DRB2 ….Sprotts metal is not available.
GLD has a minimum of 100k shares that can be redeemed for phys, Sprott does not..and looking at their web site tells me you can take delivery and then do what you like……which is normal.