Prop Research - Jack

Props:
Briefcase - He has a briefcase because it's what the hacking hardware is in. As it has not yet been established what is in the briefcase it creates enigma codes as to what's in it. And why's is there?

Handcuffs -  These have been used to position the audience to thinking that the main protagonist is actually a criminal and this is therefore justified at the very start of the opening.