I hate when they do that. It happened to me before, too.

One time I was at home waiting for my package and I heard the UPS truck stopped in between of my neighbor's and my house, so I thought my package arrived. I went to look out my window, and the guy dropped it at my neighbor's front porch and left. So I just assumed I was wrong, but I had a funny feeling about it.

Later on I got the "delivered" notice on my phone, and sure enough the guy dropped it at the wrong door...my neighbor's! I rang their doorbell, but no one was home. I didn't want to wait any longer so I just grabbed it and left. I felt like I was stealing something, even though it was MY package.