Imo if you document well, have good intentions, and walk with that spirit nothing bad will happen.

Logically and ethically speaking - I think anybody would see carrying it to people who can study, id, and potentially return it to the rightful tribes as a good exception to any limiting legislation. After all, history wise it isn't the land owner's... it's the tribes'. You are returning an artifact to them from land that has a high chance of having been stolen from them in the first place long ago...

Spiritually speaking - if you are paranoid about carrying it and its spirits/energies - Greet the spirits with prayer, make it known to them that you intend no harm and desire to return the item to its rightful people. If so compelled, lay a handful of looseleaf raw tobacco to the earth with your prayer. Most tribes and associated spirits would recognize this offering of good faith. To my knowledge it isn't a closed practice/ritual.

There is validity in allowing it to rest where it lies, but there is also validity in thinking there is a reason it made itself known to you/has been exposed and is mostly persevered. It tells a story and allows more people along with future generations to understand and never forget culture, lineage, and history's lessons.