A friend of mine needs to get a federal document authenticated for a legal case in a foreign court. The first part of the authentication process requires that the document be signed or bear the seal of the agency that issued it. The document my friend needs is neither signed nor bears any seal.
Is there any FOIA-like law or process by which federal agencies would sign or otherwise authenticate the documents they issue?
Addendum: As correctly noted in the comments, the authentication process will involve the department of state at some point. The issue here is that for the document to be authenticated by the DoS, the document:
Must include a legible signature of the official's name, printed name and title, and seal of the agency
‒ Source - under "Authentication certificates"
This question asks about any laws or process that would allow my friend to satisfy this requirement.