>>7
I quickly found the following two links, I probably should have searched this more already. I've not found much information on guerilla gardening with intent to harvest, perhaps this is something which is not done. I've ironically got some work to tend to so I'll pause this avenue of research and return sometime in the next few days.
https://freegan.info/what-is-a-freegan/freegan-practices/urban-foraging/diving-and-the-law/
https://freegan.info/what-is-a-freegan/freegan-practices/urban-foraging/health-and-safety-issues/