回复：Good point。这正是我担心的。但是，

I think your explanation is good. If he were my tenant, I would charge 1/2 of the normal late fee, because it's the first time he is late. In additions, he mailed a check to you several days before the due date. If you do receive the check next week, it means he didn't lie. You should give him a break for your own interest.