I’ve seen people locked up at the Meadowlands Flea Market (outside Giants Stadium) here in NJ for this stuff; the State Police start locking them up at one end of the lot, while at the other end there is a frantic scramble to load up the vans and beat it.
I think all any govt/police force can do is harass the sellers and keep them moving around. I imagine those folks in NJ will get fined which they may or may not pay, get their products confiscated, and be at it again another day. That’s what happens here except the ‘fine’ is usually a bribe to the cops - amounts to the same thing.
The product is easy to smuggle in; the demand is there; there is no practical way to identify buyers after the purchase or show criminal intent during it; and it is a crime nobody can work up much indignation about or sympathy for these companies.