I suppose there are a few questions I have too:
* What sort of thing would an experienced collector usually offer to the owners of the property to get them to part with a couple of these trunks? It should be kept in mind that individual plants aren't usually considered precious here, as they impatiently rip out plants that are recovering from frost damage, but also that these specific bushes, as ugly as they're kept, are probably considered integral to the decorating scheme of the property. I've considered offering newer matching plants for a few that are "rotting" so I can use them in my "art." But I'm not sure if this is the best approach.
* If I got them to agree to let me have a couple, I'd be better off digging them out sooner rather than later so they don't get impatient and rip them out themselves or just change their minds. (Also, I'm moving 6 hours north within the next 2 months.) Is it very difficult to move older privet in the summer without damaging it too much or simply killing it?
There was one more picture I had that I didn't upload with the rest because it was overly large. I've resized and cropped it to bring a little more attention to its important feature, which is a bunch of roots growing downward through a hollow area. I'm not even sure I'd pick this one to take, but there's just something I really like about that feature.