A colleague came. I was crying and laughing at the same time. He sent a package of documents to the customs. I did not get in detail, but the point was that the customs had to put the stamp and send them back.
Here is a letter from the customs. A envelope, with all the documents, but without seals. And note that the request was not fulfilled because there was no envelope in the letter to send back the printed documents.

They wrote that there was no envelope to send the documents back.

Written in a letter, in a envelope.

With all the documents.

But unstamped, because they will not be able to send back.

I cry with my colleague.