They are offering 10K reward, which is good. But.... it needs to be offered in the right way. That can make a huge difference.
There was a murder case in SC where the offered reward generate little interest. The suspect lived in a very similar area as the Navajo Reservation: A black township in rural South Carolina where family loyalties were strong and a distrust of outsiders ran deep.
The family then hired a very skilled private investigator. The investigator was black and was also from rural South Carolina. He knew the people, the culture, and the way of life.
First thing he said was to give him the reward money in cash (20K in twenties). Then, he went door to door in the township.
He talked football, the weather, church, the murder- and the reward. He then showed the locals the bag of money (look- dont touch!). With in days the same community that had "oh hummed" the billboards had the phone ringing off the hook.