Case confusion: “der ausgefüllten Dokumente” or “die ausgefüllten Dokumente”

Question

I would like to reply to an email in formal context. I have doubts regarding the German counterpart of the English phrase:

Please find attached the completed documents.

Is the German phrase written below apt and correct in regard to the context?

Im Anhang finden Sie die ausgefüllten Dokumente.

While browsing through some random documents I came across a sentence in which der ausgefüllten Dokumente was employed, I was wondering how a neuter noun in plural could be assigned der in the concerned sentence. I am aware of the genitive case but I am not able to get hold of the gist!

Der EUROPASS-Rahmen und die zugehörigen Unterstützungsdienste sollten sich auf ein geeignetes Informationssystem stützen, das eine koordinierte Verknüpfung der ausgefüllten Dokumente und deren Bereitstellung für die Inhaber im Internet ermöglicht. ^{(EURLEX 52003PC0796, section 2.5)}

Answer 1

Yes, der ausgefüllten Dokumente is genitive (meaning of the completed documents). The sentence is from an EU document, which means that it exists in all official languages of the EU, including English and French:

The Europass framework and the related support services should rely upon a suitable information system, allowing to link in a coordinated way the completed documents and to make them available to their holders through the Internet.

Le cadre Europass et les services de soutien connexes devraient s'appuyer sur un système d'information adapté, permettant de relier de manière coordonnée les documents complétés et de les mettre à la disposition de leur titulaire par Internet.

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Regarding the other question, a more common phrase would be:

Die ausgefüllten Unterlagen habe ich beigefügt.

I think Unterlagen (always plural) is better than Dokument(e), which makes it sound like very official documents, such as a birth certificate. If it is actually a form, das ausgefüllte Formular would be even better.

Answer 2

In your English original, you are speaking about one document, singular.

If that is what you intend to say, the following is correct:

Im Anhang finden Sie das ausgefüllte Dokument.

I slightly disagree with chirlu about the usage of "Dokumente" and "Unterlagen", at least in a computer context. Your PDF document is a "Dokument", regardless of whether it contains your CV or a party invitation.

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chirlu is right about the form of "der Dokumente":

noun phrase (eine Verküpfung genitive attribute (der ausgefüllten Dokumente))