Royal Mummies Hall at Gizeh?

I believe that this photograph was taken when Egypt's national collection was in the Gizeh palace after 1890 and before 1902 when the collection was again transferred to the newly built Cairo museum.

The picture appears to be taken with the 21rst dynasty high priest's family coffins in the foreground though I can only make out about a dozen possible coffins. That would represent about one in three of the mummies found in the king's cache DB320 at Deir el-Bahri.