Do you still send the book(s)?  PBS rules require a PM when someone orders a cookbook, so I sent one describing the condition of both books that were requested.  No answer.  Now the system is prompting me to mark the books mailed. Should I mail them anyway? Cancel the order?

Unfortunately, if you get no response, you will have to cancel the orders, since the rules say you must have an agreement with the requestor for the damages. Next time, always give a specific "respond by date" and let them know that since PBS won't allow you to mail them without a response, if they don't respond by xx date, you will have to cancel the order.

That's true - I forgot about that part.  Thanks!

If the books are in postable condition, fell free to mail them out.

You only have to PM, if the books have writing, highlighting or stains on them, and get acceptance of those first. If a cookbook or textbook meets the "regular book" postable rules, you don't need to PM first.

This is why I put a specific section in my RC's pre-approving the condition of cookbooks. It's helped quite a bit! :)

Sorry about the problem with your order, though. Sarah is right that if your cookbooks are postable by PBS guidelines that you can go ahead and send. But if there's writing or staining, you're stuck.