If your neighbor signs for it, then possibly they can be held liable but it would have to be a dollar amount worth prosecuting. Plus you could file a complaint with ups and their insurance possibly may cover it. If something from ups is accidentally dropped off at your place and its not yours but they think it is, and your not home to sign for it, they can bitch a lot but theres nothing they can do. Ups will also leave packages at your place without anyone being home time to time. Every situation is different. Im currently yelling at them because I bought a porno and the box came fuking empty. You could tell it had been cut open. Some stupid kid slinging boxes for them stole my fucking tape. I am currently threatening "terrorist" like activities to get there attention. There assholes. But not nearly as bad as fedx they are the worse of the worse! As far as my prosecuting comment, very hard to prove anything even with a sig!