There are also places where clay containers were used for shipping, but because they could just be made at the source, they were destroyed at the destination to avoid having to ship them back.

There's a huge landfill (I forget where) that to this day is basically just an artificial hill made out of pottery shards

Ryan ripped this off of Belgian Electronic artist Technotronic’s 1989 hit single

Cunkposting

How pot would survive thousand year in dirt that shift?

But also unbroken pottery probably not leave behind when leave area. So fragment left for archeologist only broken.