No video, unfortunately. I'm in World Tier 5 - GS 495. I believe it was happening last night, but I wasn't really paying attention to it until I opened the game for the first time today and noticed that I received a purple drop even though the game was closed / computer was sleep for 8-9 hours.
I don't suspect the game to track received loot from an activity played before the game itself was closed, which was when I got suspicious.