[mothered]

It seems like it's just a simple administrative document and not an actual legal document. But I still feel a bit unsure about what to do.

Can you post the document In Its edited form?

As such, we can provide Informed advice.

This is a rough translation of the document
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DECLARATION

Name: ___________

Adress: ___________

E-mailadress: ___________

I declare with that I did not receive order with number XXXX, which I ordered on Amazon on XXX date.

This is the item that I did not receive:

XXXX

I would like a refund of the Items I did not receive.

The person signing this document is aware of the legal consequences of signing a false document.

If that's an accurate representation of the original document In Its complete form, then It's fine to go ahead and sign It.

The person signing this document is aware of the legal consequences of signing a false document.

You're signing It "to the best of your knowledge and belief that It's true and correct", so on those grounds, the above basically has no legal Implications.