The full text of the document was reproduced on a typewriter (and before that - by hand). With number, batch, etc. Then the authorized person wrote "The copy is correct", signed and stamped.
ANDREY, we didn’t give it back, there were simply no copies. The person brought the originals of the documents to the authority, and the employee of the instance simply copied the data of these documents into large thick notebooks with stitched and numbered pages :)