Yes they can. This is exactly how they busted FPSRussia. They had a bogus Warrant which would have normally thrown out the evidence but since he had some silencers, they used that as the reason for a warrantless search of his house.
you do not surrender any of your constitutional rights just because you own a nfa item purchased legally.
The FPS Russia case was the result of convictions for drug related offenses which resulted in his losing his firearms.
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