“The average cremation weight across all adults is 5.9 pounds … according to a review of four studies published in the Journal of Forensic Sciences in 2011.”
— https://occasionalsage.com/cremation/ashes-weight-calculator/

In addition to sources available on ccMixter, the following two files were used:

bongo dry.wav CC-BY 4.0 2008 Satoration
https://www.freesound.org/samplesViewSingle.php?id=57297
Trackback on ccM @ https://ccmixter.org/pools/item/35419

Indoor Footsteps.wav CC-Zero (Public Domain) 2016 by dkiller2204
https://freesound.org/people/dkiller2204/sounds/366111/