Our courthouse had a large collection of local arrowhead and stone tools in three large display cases. During remodeling, someone stole the three large cases. A county official decided it wise to not notify the police for a couple of months. Who knows why. They were never recovered. Some had been determined to be 9 - 11 thousand years old. We border Indiana near Ohio.
Terrible! But I think it is your duty to scour the creek beds and find more arrowheads to replace the missing points. There are plenty of them out there, ever hard rain will uncover a few.