That may be true, however, see this:
Investigation and approval. Each application shall in the first instance be submitted to the chief police officer of the municipality in which the applicant resides, or to the superintendent, (1) if the applicant is an employee of an armored car company, or (2) if there is no chief police officer in the municipality where the applicant resides, or (3) if the applicant does not reside in this State.
Armored car personnel don't apply the same way others do. There certainly aren't many non-NJ residents who have applied(myself excluded), and AFAIK there aren't many municipalities with no police chiefs. So they should be able to figure out how many went through the SP as opposed to local towns.