That's the problem with buying raw books on Ebay, more hassle than reward most of the time.
And that's when you receive them. I bought two raw SA batman on ebay. They guy said is gonna ship two weeks ago and he doesn't reply to my message anymore, no tracking number, no books either
People here are much more reliable.
I assume your books are coming to you by oversea, so I would expect some delays may occur due to custom. If it was shipped with tracking...there is no reason not to provide them to you. If it's a higher value book, the seller should have shipped it by express mail or priority mail with tracking. Also, I heard registered mail is the safest, since it's being carefully handled and tracked by the post office. Now, a respond from the seller will be good business conduct.
I am pretty sure he didn't ship them. They was supposed to be shipped to Florida with insurance and tracking. I told the guy that if he doesn't reply by Saturday, I will open a case. I don't know why people doesn't reply to messages on ebay. I sell a lot of products on ebay. Sometimes, people pay months late but at least they let me know.
That aint cool.