Energy has a memory effect. Depending on the environment it take more or less time for the energy to return to its default form.

For now there is no physical proof, only observation, because this belongs to "spiritual science" or religion if you want.
However, a 500 year old tree that dies has its marks and scars. Those have the memory of storms, lightning and other events. The energy has a pattern while alive and after death. It take a very long time till those memories disolve.

An ice cube melts, but the water has the memory of the cube for a short time.

Anything out there is similar and so memories may survive for a certain period. Selfaware memories may survive for a very long time theoretically.

Withing the context of "memory effects of energy " ancient mummification does make sense. Within this context it is possible to incarnate or leave the planet or to land on earth. It may be based on decades of trained mind/consciousness. It may be a highly compressed memory from a trauma like a violent death, as in bursting planet planet/star for example.

Within the electric universe it makes even more sense, because there is a huge network of flowing energy to travel on.