DIY method: https://makezine.com/projects/build-wi-fi-drone-disabler-wit...
Pro Method: https://www.droneshield.com/blog-content/2017/1/14/drone-def...
Seems to me with DIY method you aren't breaking any FCC regs (uses a wifi de-auth). Still I would do it out of direct line of sight (hidden/obscured area) in case operator catches you on camera.
When you pick it up just ask them to kindly come by and pick it up.
Being nice works well when people are doing questionable things (and possession is 9/10 of the law if they are not nice in return).