The day before a key meeting last year between a lawyer for former President Donald Trump and officials seeking the return of classified documents in 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 Trump’s valet in the White House — move the boxes and ended up lending him a hand. But the worker had no idea what was inside the boxes, the person familiar with the matter...