I've been in construction a long time. We have dug up a lot of things in mass excavations. There is an unmentioned understanding on a commercial construction site. We don't find bones, fossils or artifacts. We have found Model A wheels and tires, soap dish clay bricks, part of an old pisol, a house, part of a boat, etc.
We don't find bones, of any species, ever, no matter what.
I also worked commercial construction back in the late 70’s when it was a different time. But I would guess if I reported bones to my foreman, he would have said “I’ll take care of it.”
Years ago, MI ran an ad campaign on TV - “If you see this endangered snake in your yard, call DNR, quick!”
I laughed so hard I cried.