Colleen Moore. Why Can't I find...?

Why can’t I find any of Colleen Moore’s silent comedies, or her few sound films, on DVD?

The only thing I can find are her early, drama roles.

Saint Eve Of The Silver Halide Knickers, can you help me?

According to the crowd at alt.movies.silent, most of her surviving films are under the control of Warner Bros., who (at this time) seem to not be interested in releasing them.