Yes, surely there must be more undiscovered Bix photos around, perhaps in old albums stored away in boxes and cartons up in attics and elsewhere. And that goes for home movie footage too, taken by local Whiteman fans when the boys arrived in their local town on the 1928 Autumn Tour.
The tragedy is that some uninformed person may, when having a clear out, throw these very valuable items out without realizing their worth to jazz history.