We will have enough once all these people have been arrested. Until then, collect everything you can, just like law enforcement does. The FBI might receive thousands of tips in a case, with few actually being viable leads. Each one is investigated. We are already making an impact.
You are acting as if they put in in their car, took it home, and passed it around to all their friends. It can absolutely be used as evidence. Literally countless convictions have occurred that began with a person finding bones, picking them up not realizing what they found.