I've been running into these the past week since I picked up a handful of the old car style cell phones and some cable/satellite boxes.
What i've been finding that works is a screwdriver will fit between the tamper pin and the wall of the insert bit. The great thing is that none of these usually have much torque on them, so they are easy to back out. If it breaks, it breaks off the tamper pin, which then allows you to go back to a standard socket. I did ruin one flat head screwdriver (a lifetime guarantee Craftsman) doing this this week.
FWIW, beats spending $50 on two sets of tamper proof bits. I'm sure you can take the time to break off the pins, but I feel that this is faster (for me). YMMV
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