How long before Indiana Jones is told by Wokeys that he has to to return all the items he stole/gave to a museum from other countries?

The Museum curator explicitly refers to an international treaty for antiquities in the first movie. I think they have a condescending-yet-possibly-accurate-for-the-time notion that they have the resources to study, preserve, and make available the pieces which Dr. Jones the Younger "acquires" in his..."travels"...