The collection in question:
https://cds.cern.ch/collection/IT-UDS-PUB%20Source%20Archive?ln=en
The report number of the source file corresponds to the record created based on it. Many of them are missing files.
we need to decide if these files should be kept. WIth Jean-Yves we found that these are the based templates for various existing articles, not used since ages.
Please let us know what you think. We believe they should be deleted.