He bought ten seven-disc CD cases.
After listening to a newly purchased CD, he puts it in the box. When it's full, take out the express delivery note, write the address on it, stick it on, and send it away.
But every time, I received the box of CDs sent out again the next day. The courier note says "return".
He knew it was not a return that was returned by the recipient.
If you go back, it's because there is no one here.