Particularly with TRS19, I've found many "built-in" assets in recent payware routes. These should be marked as payware, as creators, like myself, may inadvertently use them with the expectation that they are dependencies of routes that come with TRS19, either vanilla or platinum. Sucks when you have to replace those 200 assets and can't remember where they were all used.
You can set filters in surveyor, Payware, Built-in and locally modified all set to FALSE. Individual assets can be checked in CM by using "view dependants".
Graeme