Assuming the stats are enabled in the display profile assigned to your display, it should send them back to the CMS as described here - Statistics reporting
If you look in your CMS, how does the proof of play stats page look like there?
Assuming the stats are enabled in the display profile assigned to your display, it should send them back to the CMS as described here - Statistics reporting
If you look in your CMS, how does the proof of play stats page look like there?