The value and "accessibility" of the collection/filing-boxes/heap-in-the-attic would be much improved with the who-when-where-what-why notes for every neg-sheet (and I am sure that was in the wrong order).
There have been people mentioned in the local press, with 'probably' useful collections, who have been turned down by local museums due to the huge amount of work needed in deciphering and cataloguing the material - especially in the present economic climate that cannot possibly be done. If the material is mostly local in nature then the content is probably already covered. Sad but true.
On the other hand, you could also make a side collection of stuff which is special in some way, and that would most likely also be more practical to catalogue yourself . . . even to exhibit it while you still can??