Is there a way to know if a book/novel is written in First, Second or Third Person POV? *I speak of books in their box sets, etc*?

What an incredibly stupid question. Why is the book's "POV" your one and only consideration for whether you're going to buy it?

If you absolutely have to know, get a copy from a library, or read an excerpt in a review or on the publisher's website.

By reading them??

You could read the first page.