An initial check suggests that the Famous Funnies reprints of Buck Rogers started with strips from 1933. I haven't officially discussed the matter yet with the rest of staff, but I suspect we'll just be waiting on those from an overabundance of caution.
With that said, if anybody has scans of the Buck Rogers comic strips from 1929 available (not reprints), we would be happy to host those since they're safely PD at this point.