The best way to find that information is to ask the
locksmith. It is not uncommon that a good locksmith maybe working towards that qualification, and though he or she may not have the piece of paper that certifies them as a Master Locksmith or be able to display the Master Locksmith Association logo, they still know enough about their craft to apply it successfully. Some locksmiths and locksmith companies state it on their website or shop front. It is fair to say that if a locksmith has the qualification it will be clearly displayed to potential customers.