No, "to a neighbor" is correct. Although the delivery guy will not make a dedicated effort to find an available neighbor because of time constraints. I suppose that when they deposit the package with a neighbor, it's because the neighbor received a package themselves, so they could ask them to take your package as well while signing off on their package. Most of the time, when you cannot receive your package personally, you'll get a card telling you to pick it up at a branch office of the postal services (which usually means some small unrelated shop like a drugstore).
