9 cards where the illustration contains “briefcase”

Agent's Toolkit (New Capenna Commander #166)
Auton Soldier (Doctor Who #36)
Brokers' Safeguard (Alchemy: New Capenna #20)
Courier's Briefcase (Streets of New Capenna #142)
Psychic Pickpocket (Streets of New Capenna #54)
Rhox Pummeler (Streets of New Capenna #155)
Rumor Gatherer (Streets of New Capenna #29)
Sleight of Hand (Wilds of Eldraine #67)
Vivien on the Hunt (Streets of New Capenna #162)

The message was clear to Sorin—time to search for something else.