this is pretty regular. It happens a lot with people who order large amounts of "suspicious chemicals" Styropyro got a visit from, i believe the ATF, might be wrong it's been a minute since i've watched that video, for procuring chemicals that can be used for nefarious purposes in mass quantities.
Similar things have happened with farmers, (fertilizer can often be used in improvised bombs) You will almost certainly see something similar if you directly threaten the government, though it's usually "hey uh, don't do this, this is bad, also we're going to make sure you aren't a terrorist real quick.