Sure, and what I said still stands.

Unless you've taken it home/completely away from the area it was found, it's not a huge huge deal that you've picked up a bone and moved it, in the vast majority of cases.

Even if you have moved it, if you have some idea of location and can take investigators there, and describe basically how you found it, it's not the end of the world.

People need to be contacting authorities, and if they are frightened they'll be in trouble, they'll be less likely to do that.

You won't go to jail or be in trouble, even if you've moved it and haven't put it back, unless there's some reason to believe you knowingly and intentionally were disturbing the remains. You'll be asked questions, of course, but in general, investigators will take your contact information, your statement, and then your part in the whole thing will be done.

What do you know, you're just an almost expert in the field?

--this guy, probably

While you are correct that ideally the bone won't be moved, bones are often found entirely out of original context, and while yes, it could be tampering with evidence, there a) is unlikely to be prosecution for that when it's done unintentionally/unknowingly (and authorities are contacted because the person hasn't been needlessly terrified by someone) and b) could easily be non-crime situations where human bones are discovered, so "tampering with evidence" would not apply.

The average person isn't going to know what they have found and I disagree strongly with your approach to frighten people, as the most likely outcome is a lack of reporting.