Never play with a hard-working man’s money!
Judging by the appearance of the room it’s likely a trailer, for some kind of construction office. He may be contracted through another party or may be working for ‘cash’ even if it given in a check form.
He isn’t ‘legally’ working there, though he’s supposed to be paid, they don’t clock in or out, and nothing is written down so they don’t have to pay for workers insurance or something. There is no paper trail to prove when he comes and goes as a worker.