Re: What are we trying to prevent?
Exactly. If they want it bad enough, they will take it. If not on some phone/laptop, email forwarding, etc. then the old-fashioned way... print it out and tuck it in the briefcase.
I worked at one place that checked briefcases at the door. One enterprising lad, stuff envelopes with what he wanted and addressed them to a PO Box. He then dropped them into the corporate mail system. Sometimes he put the postage, other times, the company automatically did. He was caught when an envelope accidentally came open in the mailroom.