IMO, based on the jail phone calls between WH & WHS, that they both knew (or at least WH knew) were being recorded - most likely being listened to in 'real time' by LE, that based on the q & a exchange between siblings, LE was able to piece together where to find AJ. If it wasn't from a 'tip' (assuming public), but LE investigation work or however they termed it, then it was between the sis who 'had his back', and he trusted completely. And, she perhaps unknowingly at first, got the answers....she herself said his story kept changing. Horrifying all the way around, IMO.