I've been seeing some records for manuscript items (hand written, unpublished) with 264 _ 0 and $$a [Place of publication not identified] : $$b [publisher not identified]

This is confusing to me. Is this right? AACR2 didn't have a subfield a or b because the item wasn't published. 

Can someone tell me what is the correct way to do a 264 for manuscript items?

Thanks for the help.

Angie