That's fair narmac....but with updates coming out every two weeks, you can at least determine a range.  When shorts increased their cumaltive postion by 50 odd thousand the last update but one, its not hard to dertmine at least what price range those shares were shorted at.....and you can do the same going backward all the way to May when the PPS was around $1.30 and there were only 1,500 shares short.

Of course there can be shorting and covering going on between the updates....but unless something really funky is going on that activity can't be taking place at prices lower or higher than where RVX traded.