You should definitely try and straighten them out for their future good. Keeping negatives rolled up is asking for them to get scratched as they're unrolled and rolled up again.(posted 8845 days ago)Unroll them very carefully and hang them up full length with a weighted clip, such as a bulldog clip, on the bottom of them. Leave them like this for a couple of days if possible. In the meantime get some proper negative envelopes and a loose leaf folder to store them in. After being stored flat for a while any remaining curl will gradually come out of them.