Date registered: Dec 2005
Vehicle: 222.132 & 221.122 & 213.050 & 906.633
Mentioned: 3 Post(s)
Quoted: 39 Post(s)
Which car do you have? If it is any of the more recent models, you would not be able to make a copy (except for the metal key).
You should order a new key and have the lost one disabled. The one who found your old key would still be able to get into the car with the metal key but could not drive it or disarm the alarm. If you are afraid of that, you would have to change the door locks and the one old metal key.