“When it was clear that there were no Soviets around, the truck was stopped at the last possible turn-off, a canvas was thrown over the crate, and a new driver

“When it was clear that there were no Soviets around, the truck was stopped at the last possible turn-off, a canvas was thrown over the crate, and a new driver took over. The original driver was escorted to a hotel room and kept there for the night” They elide over the more potentially incriminating parts... how did they convince the driver to work with them?