I think the best thing would be to wait and talk to him, if you don't the time, leave another note with your phone number asking him to call you. If he don't call you, then I would go to other measures. I know from experience that misunderstandings can happen. A fellow came ripping up in his pickup truck, blocking me and looking very menacing. As soon as we talked, he realized I had permission from the land owner to be there. Just saying in the long run its always better to talk first.