IF you’re going to do this, make sure use some sort of sealed package (like the box in the photo). You used to be able to slap these things on like a sheet of plywood and just send it as is but now if the package isn’t sealed and is obvious misuse the post office can just throw it in the dumpster. If its a sealed package then the post office has to deliver it and the permit holder has to pay the charges. https://about.usps.com/postal-bulletin/2019/pb22525/html/updt_001.htm
I can (anecdotally) confirm the overclocking sensitivity. Although it seems to be more that this game just REALLY pushes hardware if you let it which is naturally gonna draw out overclocking instabilities.