Taking them down will not alert the Detroit policemen.
The game tells the story of Adam Jensen, a man cybernetically augmented against his own choice who finds himself in the middle of a global conspiracy to which he holds the key.
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Once that dialogue completes, you can trigger the C. Radford will give you the keycodes for the locker (it is not an email you can read later, but the keycode will appear when you hack the PC).
The locker is in an alley next to a flaming car, and there are about six corporate goons there.