> Mummy brown was a rich brown bituminous pigment, intermediate in tint between burnt umber and raw umber, which was one of the favorite colors of the Pre-Raphaelites. [It] was originally made in the 16th and 17th centuries from white pitch, myrrh, and the ground-up remains of Egyptian mummies, both human and feline.
Mummies have been used for resources by the local populous heck much more important things were used for local resources many monuments were turned into essentially quarries by the locals.
Exporting "mummies" and their byproduct was going in Egypt since for ever during roman times mummified remains were used in medicine, alchemy, pigments and much more. Mummia which is the "medical" use of mummified remains is documented in Materia Medica which is essentially the oldest surviving medical encyclopedia and the documented use of it dates back to at least Imhotep which was an Egyptian physician (before he was made a god).
While some of these artifacts may have had historical value in hindsight you are essentially arguing against recycling.