Marvel's Agents Of SHIELD, season 1 episode 22.
During the post-credits-type scene (it's actually before the credits, but after the SHIELD logo but, whatever...), just after Phil gets out of bed, there's a shot where the camera pans, left to right, across a storeroom. At the very bottom of the screen, out of focus, a Dominion box briefly appears. It's time stamp 39:37 if you have the DVD.
Don't know how I spotted that...