At Stockton-Con there was a vendor who was selling blind box vinyl figures. But if you didn't like what you go you could put it in a special box and take something from the box. One of the figures was a Riddler from Funko... so SOLD!
I got a Penguin, put it in the box and took the Riddler.
I asked what they do if someone doesn't want a short-packed figure. The lady said they'd treat it just like any other figure, it goes in the box. They say they'll be doing this at cons, so if you see them, check them out.