We're on the corner of a street that gets constant foot (and car) traffic, but haven't had an issue. Some shippers default to leaving things on the back porch which is fine, but mostly things are out front and nothing has been taken to my knowledge.

We also leave our primary stroller on the porch and so far so good, though it is older and not so shiny-looking. I've seen plenty of $700+ strollers unlocked on local porches overnight, though, so obviously folks aren't too worried.