Physical box offices will likely not open til August at the earliest. If the physical box office is open, the producer pays a substantial charge to the theatre every week for box office treasurers, and in this case, the staff they need to legally have the building open. They would also have to temp or other checks before people came into the building. I could be wrong (I often am) but I don't expect physical box offices to be open more than 4 week before 1st performance - and perhaps not then. Making Telecharge (the SHuberts) and Ticketmaster even richer. And theatregoers poorer.