Joshua, in his latest podcast mentioned near the end that the probability of whoever is responsible for Josh's disappearance, most likely could be listening to the podcasts.
Whoever knows what happened to Josh, I encourage you to at least write a letter and mail it to the sheriff's office.
It's been over 20 years now, Josh's family and close friends deserve this closure.
This assumes that someone other than Josh was responsible for Josh's disappearance. I think that there is a high probability that the person responsible for Josh's disappearance is Josh himself. I'm not ruling out foul play. I'm just saying that the available evidence doesn't make foul play the only, or even the most likely, possibility.