Product review (2 stars): It looked like it was a return
This arrived in a beaten up box.  It looked like it was a return.  Inside, the vent was squished, but I managed to pop it back into the correct shape.  The box said it came with clips to attach it to your vent.  Those were missing as well.  I kept it anyways.  I will say it does seem to do the job, but really, I think if I had taken a cardboard box and some duct tape I could have crafted something that was just as good.