I notice most random shipwreck, boxes, other various object assets don't drop resources if tied to a location. Meaning, random objects around beach drop resources, Example: shipwreck and boxes drop wood and nails. But, similar objects tied to a location like ruins, camp, large shipwrecks, etc are breakable but no resources are dropped. Seems when tied to a location they lose their drop property.
Just wanted to point that out to help the Dev team!