After the offering of 13 pieces at auction (two of which failed to sell, including a Frederic Edwin Church estimate at $5 million to $7 million) and a private deal through which the Lucas Museum in Los Angeles bought Rockwell’s Shuffleton’s Barbershop (1950) for an undisclosed sum, the museum, which is based in Pittsfield, Massachusetts, said that it has now brought in $42 million, well short of the $55 million it has hoped to raise in an effort to build an endowment and close a budget deficit that its leadership has said risks shuttering the museum in coming years.