This happens with your returned packages (article is in German, half of it is translated below):
Amazon shreds its returns 08.06.2018June 8, 2018
The “Destroy” shipping method is bringing Amazon into disrepute - is the online retailer really destroying tons of functioning products? The German government is already talking about a “huge scandal” Germany, Pforzheim: Symbolic image of Amazon logistics center The “Destroy shipping method” can also be booked with the logistics service provider
Tons of returns and products in mint condition, including fridges, cell phones, mattresses and furniture, are said to have been destroyed by online retailer Amazon. This was reported by the ZDF magazine Frontal 21 and Wirtschaftswoche. Both media outlets refer to internal product lists, photos and statements from employees. According to these, goods of all kinds are disposed of “on a large scale” in the mail order company's German logistics warehouses.
Amazon not only destroys unusable products, but also functional and sometimes new items, according to statements from employees. One employee reported that she destroyed goods worth tens of thousands of euros every day.
Clip from 2022, German. Signature quote: "It is not only an occasional [Euro]Palette of Items, it is whole truckloads - in all fulfilment centers, almost day by day."