hey another canadian dude in the forum.
welcome, makabi! <img src="/ubbthreads/images/graemlins/wave.gif" alt="" />
about finnigan's lockpicks, u cannot exhaust them as they're magical so that means u can use them indefinitely (unless u run out of things to pick or u end the game).
IF u happen to drop finnigan's lockpicks on the ground, it'll disappear for good.