These panels, stuck together by flat miter joints, became progressively unstuck and warped since they were no longer holding in place.
To start, I put the four panels back into their original curved form, then I reaffixed them to the carcass. I then used old oak to replace the missing back panels. I also adjusted the functioning of the curved doors. To complete the restoration, I sponge-applied a varnish and re-gilded the bronze.
Truly, this furniture, considering its quality, really deserved a stamp from the master craftsman!