Just as a sidenote: X-raying PCBs and then diffing them against clean PCBs is a worthwhile thing to do if you're concerned about hardware backdoors, or 'interdiction' of hardware in a supply chain. I do this sometimes when ordering super-critical equipment like Thinkpads from the U.S as you never know what lurks on the motherboard (keyloggers, etc).

I have a clean Thinkpad that I use to compare against potential backdoored devices. So far I haven't spotted any differences in the PCBs. I guess the intelligence agencies have not marked me as important enough to target. That being said, I imagine there are people working in the cryptocurrency space who have a lot to hide (if you own their boxes, you could be looking at thefts worth millions of dollars, or whatever the equivalent is in the cryptocurrency they are developing).