Bill, I said you owe him IF YOU KEEP THEM. I did not say you owe him if you throw them in the garbage. It is my understanding that that is the "law" on unsolicited mail - you have no obligation to accept and pay for it or to return it. But you cannot just take advantage of the mailer and keep whatever it is they sent you w/o paying for it. This is what is called a unilateral offer - one party makes an unsolicited offer and there is no contract unless the offeree "accepts" the offer. Then you have an enforceable contract. If you keep the photos, there is "acceptance" [legal term] of the offer and you are legally obligated to pay. I'm not sure about the legality where there is a partial acceptance - whether you are obligated to send the others back or not. But I appreciate the opportunity to buy nice photos of my car so I will do it.

I don't understand the instance where he billed you for an event you did not attend - what was he billing you for if he sent you no photos?