Any High grade electronics that don't have a lot of weight due to steel, but you would have to know what to look for. Off the top of my head I would look for: server pieces that can be pulled, server arrays, some switch boxes, fire system boxes, alarm system boxes, digital keypads, and of course communication boxes.
Or even easier and something I have wanted to do that would be fast, just walk around with some side cutters and cut all the power cords you can find.
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