Buying a car without keys

Or bring the glove box lock into the locksmith, it's the same key as the trunk...
It is, BUT. First off a glove box lock is optional on a Barracuda fastback. Second, it only uses three key cuts not the five that are on the key.

As has been stated, a good locksmith can make an impression on a new key. The years of grime in the cylinder will leave a mark on the key.