after being dryed and cured(maybe ur bud was some shit fresh off the plant which would explain more, but then ud be getting ripped off anyway) there would be no way a worm could survive and even if it did when he weighed the bud up to sell to u SURELY ud notice a bright orange worm poking about for fuck sake
plus if he did have an infestation of some kind then he should of attempted killing them out or just straight out chucking the plant away, i dont know why im even bothering actually its probaly bullshit anyway