Don't worry, you can use the tracking function to check at any time whether your package has been left with a neighbor or at a branch, for example. In some cases, a second delivery attempt is made via a different shipping service provider.
You can find all updates on this in the shipment tracking. If you see that the package is being sent back to us, please contact customer service and we will be happy to check if we can deliver the package to you again, free of shipping charges.