Appraiser
He took the arrowhead to an appraiser. After knowing how much the item could be worth in the collectors market, he would be in a better position to choose what he would do with it.
So he asked Pederson about a reliable appraiser. The professor sent him to Mr. Eriksen, a renowned archaeologist who got into the appraising business after getting burnt out with the academic world. Nothing could have prepared Lukas for what he was about to hear.