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See the Archival Collection Processing Manual :  Step-by-step guide: Unprocessed to End Processed and End processing for processed archival collections.

When in doubt, talk to end processing!

It is important to collaborate with the end processor on the orientation of a collection before you begin processing, so you don't waste time or supplies having to redo work. The first thing to do is check in with the end processor about what kind of boxes you should use. Be sure you understand how to label the boxes and the folders, no matter what the configuration. It may be especially important to collaborate on existing or hybrid level collections that are being enhanced or redone. For example, the Hofer inner office has flat files full of various non-standard sizes of folders that don't follow conventions for sizes or locations. When uniquely processed collections like this need to be re-housed, there are considerations about where to shelve, what becomes of remaining material that will one day need re-shelving, what might be a good use of the unconventional drawer sizes, perhaps to solve some other unrelated housing concern, what size supplies to use, etc. in order to make the collection more standardized and accessible according to our current conventions. Once the basic wishes of the curator are known and discussed, it is best to simply inform and hand over the housing for the end processor to "preprocess" the material in the most concise way possible, and get it shelved in accordance with some previously, and some newly-established shelving practices. Having the end processor do the preliminary work makes things simpler for everyone.

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