A friend of mine used to teach wiretapping to FBI agents, he has a large toolbox size set of picks, pick kits, and bypass devices. Most of it is specialty picks for certain locks or books that show the drill points, codes, ect. He told me though that 90% of the time he didn't need the stuff. He prefered to impression locks from blanks bought at the local hardware store, or in the case of better locks where the key wasn't impressionable, get master keys from hotel workers(when it was a hotel room being tapped).
(By the way, he said he didn't like to pick because he was bad at it. He didn't have very good feeling in his hands.)