It appears if you have a Raidable Base, someone raids it, takes the TC, and places their own TC and then other items like a campfire, once the Raidable Base gets destroyed, the TC and campfire are still there floating. 

Is there an existing setting or a way to destroy all the items in the zone?

Do Not Destroy Player Built Deployables
Do Not Destroy Player Built Structures

set these false and it will destroy whatever they build inside of the zone when it despawns

nivex

Do Not Destroy Player Built Deployables
Do Not Destroy Player Built Structures

set these false and it will destroy whatever they build inside of the zone when it despawns

Thank you sir.