How to restart a Missouri/kansas collection

I volunteer for a small local park with a visitor center located along the the original independence/Santa fe trail that is a historic site as it was the first stop past independence, Missouri before the Westport crossing was established around 1850. Nonetheless, this visitor center, is predominantly utilized for educational purposes by various scouting organizations. It has a number of displays of local artifacts, one of which …. until recently included an arrowhead collection from the area. However, the building was broken into and they didn’t steal anything except the arrowhead collection, which was in a decorative wood box with a glass face. My question is, how would I even start inquiring or finding about local collectors or organizations that would have collections for sale or organizations that could help us attempt to recreate something in its place, and provide historic identification for any items attained that would be historically correct for the region?

I follow this sub, and know there are several local regulars that post their finds, but don’t know their names specifically. I am generally looking for economical ways to replace or recreate one of what I thought was one of the more interesting educational displays in the center.