if you care to follow the second link to the videos I gave above , you’ll se (predominately Malaysian videos) showing people digging a lot of stuff from the ground.
Also I see videos , especially from this channel called Ethnic Indonesia , where the owner of this shop (I suppose) goes to many markets and examines artifacts some of which are obviously very corroded.
This is one of the countless videos he has on line
https://www.youtube.com/watch?v=xCEvNfBXNSM
Unfortunately I don ’t understand anything