It's not like they are looting them to Philly to put them on display. They shipped them to Drexel university to do additional research like extracting proteins and trying to extract DNA so they can make Jurassic Park.

"The researchers performed laser scans of all of the bones and published 3-D models of each. That could allow other paleontologists to study the fossil from afar and even print three-dimensional replicas of the bones. Dr. Lacovara and his collaborators are undertaking additional research to use the models to study how Dreadnoughtus moved.

Even some softer tissues like tendons were preserved, and the scientists are trying to extract proteins and possibly DNA from some of the bones."

Depends on who is paying for the dig right?

Or has the tools to properly scan/research them. I'm sure they'll go back afterwards unless the host country doesn't object.

The article confirmed that the bones will be going back.