You can find the budgets for almost all of the funded organizations online. You’ll see a line item for “RAD Grant “or something similar.
If RAD was falsely claiming to give a grant, and the institution never received it, they’d certainly be complaining.

Also, there’s multiple levels of outside auditing. Both RAD and most of the recipients have annual financial audits, as well as audits to show that the money was used for the intended purpose.