There was an article early on that reported that Duncan’s ticket was paid for by a company credit card. It was a round trip ticket. The name of the company was not the same as the one that he quit. Whether it was affiliated or not, I don’t know.
Silson Global's business (authorized contractor for UPS) was obviously centered on the airport. As was that of Duncan's employer, Safeway Cargo, a FedEx contractor. Duncan was the personal driver of the General Manager of Safeway.
I suspect Duncan knew someone at Silson, and some money, much less than the value of the round-trip ticket, changed hands.
Yes, he bought (or someone bought) a round trip ticket. With that visa he needed a round trip ticket. But he had no plans to go back according to his nephew. He was going to get four or five jobs here and get rich. Sure