I didn't insist that they wouldn't, I said that they might not, or they might have one in the morning.
Had it been any other time than Harvest, you'd have a valid point, BUT you've argued that there was no reason -having worked the best part of a 17 hour day- why he'd be either dirty, dusty, sweaty, smelly -possibly blood spattered- whilst a balance of probabilities suggests he'd be likely to be all these things.