better the land owner find out from you, than from someone else.
i would get a lil upset if someone was coming on my property and no one told me, and i found out from someone else that you didnt tell me.
so maybe just throw it into a conversation with the land owner...
let him know you dont think you have to worry about this guy anymore and he seemed honest.
this way if it goes down again, you have the land owner on yer side, and ya dont have to back peddle bout why ya didnt tell him the 1st time.