The real files are not incremental by numbers but totally different names in totally different (sub)directories.

That's the problem with providing example data which has an inherent pattern that doesn't match your production data. It suggests to those wishing to help that the pattern matters and therefore they are likely to take this into account. If you don't want to give an excerpt from the production data for some reason (security, embarrassment, NDA, ...) it would be better to put something purely random (but still representative) in its place. For a short dataset your favourite metasyntactic variables would suffice.