When I had to sign once I wait till the day they are going to ship it back. Then I went and staked out the place early in the morning. Watched to see what cars came and went into the place. Once I knew the place was clear, I went in. Checked out the place pretty good. Nothing. Walked up to the counter and handed the lady the note. She goes in the back and I start the my internal timer. If she's back there for more than 2 mins I'm not going to sign for it. She came back out and I watched her very closely. People will usually give themselves away by different forms of body posture, eye contact, or anything. Nothing. She handed me the package in the usual USPS lazy drag your feet fashion, I signed, I walked out and went home.