I tried to report a supply Drop that isn’t publicly accessible, and when I tried to send it, I got this:
Report could not be submitted at this time. Please try again later or contact customer Support.
I tried twice and got the same result, so it looks like something isn’t working right.
Also note the capitalization of “customer Support”.
I also found it odd that on the “tell us more” page where you enter the info on the bad SD, it says “This report will be sent to Google and governed by Google’s Legal Notices.” Seems odd that a report about a SD location would go to Google.