Now the question is arising that people asking about the leaving the note for UPS and worried also for their important package that has to delivered on the scheduled date so I will suggest you not get worried about your package you can leave a note for a person coming from UPS to deliver your package.
If the sender has specified for the signature then if you leave the note then also he cannot deliver the package to you. As we can check the status of the package via tracking number which has been provided to you this helps you alot in knowing about your package.