So do you require your distributer to take pics of every place they put the flyers? How do you know for sure they distributed all of them? I mean, they could just take 10 pics in 10 different places where they put 1 flyer each and then just trash the rest.
Dropping in to provide my experience on dealing with people from CL for flyer delivery. https://www.blackhatworld.com/seo/case-study-offline-pay-per-call-campaign.891151/page-3#post-9458736
Just be aware of people taking shortcuts on ya.