In my case, I had some documents that would be somewhat helpful to outside researchers; however, the options in my boxes were very limited. Most of the documents in my boxes were class notes, handouts, assignment instructions, graded papers, etc. However, some of the documents included required or suggested readings for his class.
Class notes, handouts, instructions, and graded papers likely will not be useful for an outside researcher. They provide no information about prewar Japan, perhaps with the exception of student papers. However, I find it unlikely that a researcher would be interested in studying student papers, considering the lack of a students’ authority on the subject, and the papers likely would not include any information that the researchers would not already know or could not find from a more reliable source.
I think that the required and suggested books could be useful for researching postwar Japan. Whereas a student paper is likely to be based on these readings with a chance of a poor interpretation of execution of researchers, the books themselves have been carefully selected by Mikiso Hane and are therefore likely to be reliable sources, considering how well respected Hane was in the field. Thus, I believe that Hane’s list of recommended historical books would be very beneficial to an outside researcher.
The teaching materials boxes were particularly difficult for this question, because while they would be useful to a researcher interested in the history of education (or the history of history education), it’s harder to figure out how they might help a researcher looking into the influence of Japanese Americans on the field of history in the postwar. You might be able to make a case for the way a history is taught having consequences for the development of the field, but it’s likely the researcher in this prompt would be more drawn to other boxes.