A maintenance worker for the former president recounted helping to move boxes into a storage room a day before a Justice Department official came seeking the return of classified material. The day before a key meeting last year between a lawyer for former President Donald J. Trump and officials seeking the return of classified documents in Mr. Trump’s possession, a maintenance worker at the former president’s private club saw an aide moving boxes into a storage room, according to a person familiar with the matter. The maintenance worker offered to help the aide — Walt Nauta, who was Mr. Trump’s...