Just posted 3 workbooks in the RAOK forum because they have a few pages completed in them.  Didn't realize they were WLed until I had it posted and then I checked the ISBNs.

The workbooks are postable if it's only the issue of having several pages completed, under the "textbook/workbook" exception. You just have to PM the requestor and cancel on your end if they don't want them with writing. 
 

From the help docs:

Exception: if it is a textbook or workbook, these are expected to have highlighting/underlining/writing

• if you post a textbook/workbook, the condition must be described to the requestor in a Personal Message
• AND the described condition MUST BE AGREED TO in a reply PM before the book is sent
• This is the one of the ONLY three cases in which a PM exchange about a book is required before the book can be sent (the others are for travel guidebooks and cookbooks--see below).

Sophia, thank you!!