if you live in a good neighborhood or are in a office building ups will most likely leave it, even though sprint requires them to take a signature, most the drivers dont give a sheet. however, if you live amongst the killas and the goons, ups will prolly not leave it and will prolly lie about attempting to deliver it, just so they can avoid ur neighborhood. u know what happened to the last ups guy that tried to make a delivery in the hood:
http://www.cbs46.com/news/15076745/detail.html