With effort, Arthur and Numbers are able to open the safe; when the door swings open, it's not money but several vials and bottles that glare back at them, what appears to be the deed to his house and title to his car, and one final object:

— Haloperidol
— Pancuronium bromide
— Potassium Chloride
— Scopolamine
— Sodium thiopental

— A pistol with a narrow barrel and unattached suppressor.

How extensive is Numbers' and Arthur's combined knowledge of the history of firearms?