According to the Help Center:

If each of the books bears a unique ISBN, you can Post each as a separate entity

• this way, you will earn a credit for each.

If the "box" holding the boxed set bears an ISBN, you can post with that number, BUT

• this way, you will earn only ONE credit for the SET.

I understand all of this, but what if each book AND the "box" each have a different number?  So I have a boxed set with three books and a box, with 4 different ISBN numbers.  Does this mean I can either post them separately or as a "box"?  Not sure what to do here.  Thanks in advance for your help!

I think you can post them seperately.  THey may not all be ordered by the same person though.

You can either use the ISBN on the box and post them as a set in which case you would get one credit for all 3 books in the box or you can use the ISBN numbers on the 3 books and post them individually. This way you would get 3 credits for the 3 books.  You could also try offering the entire set in the Book Bazaar for 3 credits and see if anyone is looking for the set.

OK, thanks!  That's what I'll do.

I had a boxed set like that and I listed the books separately, as each one was a WL book.  If I'd  used the box ISBN, the entire set would have gone for 1 credit. 

I tend to offer box sets in the book bazaar.  Most go very quickly, and I think all were taken. I usually knock one credit off the price--so a 4 book set I offered for 3 and a 6 book set for 5. 

I just don't like the idea of splitting up a box set.  Nor do I want to send multiple books for one credit.

I'd defnitely post in the Book Bazzar and look for someone that wants all 3 in the box for 3 credits.