A publicly-funded archive in England provides a service to allow members of the public to copy, with a copier on site and for a nominal fee, documents. The documents are very old, so that any person involved in their creation died long ago, and their copyright would normally have expired. The archive stamps the new copied document "Copyright retained by owner of original document", with the implication that the original document is on loan to the archive and this stamp is a requirement of the loan conditions.
Creation of the new paper copy by pressing a button on the copier involves no significant creative input. How can either the archive, or the original document owner, claim any copyright, either on the original document or the new paper copy?