"Safe place"
Now I get it. The tracker isn't in the van, it's in Jeff's smartphone. And looking more closely at the street map, it appears he's not in my back garden but my neighbour's, placing his delivery package in its "safe location" at the back porch.
Which is now not so safe as it has broadcast the fact that mateyboy has just put something there. With my security hat on, this is a potential vector, quite aside from the privacy of the worker delivering the packages.
Still, this is Dabbsy's column, so I shouldn't be so bloody serious.