not sure if you found your key!!!...go into a nissan dealer and give your vin number to them...they should give you the key code..its yours so should'nt cost you!!!...go to a lock smiths..key supplied and cut poss a tenner!!!!...then get the dealer to code the new key in..roughly 35 quidish!!!..but if someone finds your keys,ok thy can get into the car but the code for that key will not not work so the car will not start!!!...a new lock kit i think is a silly price of 200 pounds!!!..hopes this helps..