India Post — stolen of some items from the courier

I want 2 inform u that I had sent a courier via speed post but it reached its destination very late n some of the important items are stolen out of it like I sent many golden coins of rs 5 and some chocolate and 1 more things are not their in courier. Now I dont knw where the mistake happened I js wan my all stolen stuff back unless I'll gonna complaint in police.kindly take strict actions as soon as possible.