Re: tamper-proof screws aren't
I have a small fitted plastic case containing 154 bits that can be used to remove nearly every "tamper proof" screw known to man. It cost me all of $19.95 from Ace Hardware about 20 years ago. They are not the best quality tools on the planet, but they have done the job for me all these years. And wonder of wonders, I haven't lost one yet ...
All you "remote job site" folks out there would do worse than to keep such a kit (and the required 1/4 inch driver) in your traveling gear. I also throw in a complete 1/4 inch ratchet set, just because I can. Has saved me I don't know how many hundreds of hours over the decades.
(Since I last posted this, I've run across a couple new bits that my kit doesn't handle. A dollar or so later, and I'm covered. That's a pretty good price for a once in a couple decades upgrade!)