Are you sure of that?
This has been an urban legend similar to the “bus loads” brought in from MA(which is also BS). The only bussing was at UNH Durham, where they offered a free bus ride from the college campus to the polling place in downtown Durham.
I show an ID to be given a ballot in the town I live in.
If you are a new resident you need to show a bill from Eversource or some other utility that shows that you actually live in NH. Again, the only place this may happen in any quantity is in Durham(UNH) area where there are 27M students.
My understanding is that there are precincts in Nashua or Manchester where they do not follow the rules.
Democratic organizers are smart enough to do their homework and identify those locations.
Durham(UNH) area where there are 27M students.
27,000 students.