Some stuff I've noticed over the last couple of weeks.

• Most deposit activity is in the morning between 07:00 and 11:00 - average of about 15 deposits per day.
• Using unshelled peanuts is a good way to attract corvids without attracting pigeons.
• This will work best in an urban environment or near a public space like a park, square or stadium where cigarette butts, bottle caps and similar litter is easy to find.
• Birds may get territorial about the vending machine. I used to get a couple magpies and the occasional crow. Now it's all jackdaws.

Now the jackdaws are pros at depositing stuff I leave around the feeder.

https://cdn.hackaday.io/files/1847547904515136/VMFB-MC_09-24-52.mp4

I might try putting a few marked bottlecaps in the complex garden to see if they end up in the vending machine.