My son has played/trained with a large portion of kids on that east team. The majority come from Bingham and Harriman area. #7 on east played for Herriman, then Bingham 2 years.. now East. Jaylan Vickers (BYU PWO last year) played for Bingham then transferred to East his Sr. year... The list goes on. The East coaches tell kids they'll get better recruiting opportunities at East.
As for the East Boundaries... Yes, I know the boundaries. But the boosters that pump the money into the program won't let their kids play football. I have family and friends who's kids go to East, they are the first to tell you they 'import' their football team.