Secure briefcase + cuffs interaction
currently one good slip from a clown or a wet floor patch or a disarm means the secure case is gone taken by an assistant into the maints to be lost forever.
To combat this i would like to suggest the ability to cuff the briefcase to your arm.
Doing this will cause you to lose the use of one of your hands due to not being able to drop the briefcase and it will use the handcuffs in the process.
removing the cuffs from a person can be done through standard methods gibbing, amputation and the like but also like cracking the safe using a stethoscope that should also be an option for the very sneaky and robust of you