The value of a document is closely related to the content it contains, but it also has a very high connection with the carrier of the document. For example, a well-preserved piece of information from the Middle Ages can easily sell for several thousand euros or even tens of thousands of euros.
However, if it is an imitation from the 1930s to 1940s of the 20th century, only the same material and the same copy of the excellent work can be sold for several hundred or even thousands of euros. If only the document content is transcribed without aging it, it may only be a few dozen euros.
Of course, these things have different degrees of difficulty to sell. If it is an original, it is very easy to find buyers, and it can be sold at a premium when selling. Those modern imitations are not only difficult to sell but also have to be discounted.