IMHO, your feedback was completely appropriate. I also don't think you were under any obligation to contact the seller. Suppose you DID contact him and he says "Gee, you're right, I won't do it again" - and then he DOES do it again. Now future buyers are getting poorly shipped items without any warning from you. On the other hand, he could see your feedback, post a reply to it saying "you're right, lesson learned!" and future buyers will know both sides of the story.
Again, I think you did things 100% correctly.
Tabe
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