Yup barter...a divy is one of a few ways to get a count on the valid shares that I know of.
Anything that affects the certs has the same effect I believe, including a name change, a move to another exchange, changing the CUSIP, and at least one other method that escapes me at the moment.
If there are any big short positions or counterfeit shares, Downs hasn't left em an inch of wiggle room at this point.