Our hardbound books do not necessarily come with a WileyPLUS code. They would have to come as a bundle, available at school bookstores, and it would have been bound together with your text. The code appears on a pull-tab registration card.
If your book didn't have one of these, then you more than likely just purchased the book itself and not a bundle that included a code.
I recommend double-checking with school bookstore.
Tom with Wiley