These will be unlocked after completing the Act II mission, “A Risky Bid”. Find the bidder in the marina and hack his phone. Once the briefcase's location is revealed, head there and hack the security router. Scan the briefcase to complete this activity.
The second bidder is located in Parker Square's Botanical Garden to the north. After knowing the location of the briefcase, head there and hack the security router. Scan the briefcase to complete this activity.