I sent you an e-mail, and here's the scoop in case other parents are curious.
The right place to find out who can go to a school if it is confusing on the East Side Union School District web site "boundary maps" and "district locator" is to call the registrar at a specific school The registrar at Evergreen reports that this street "Lyons Estate Ct" is in Silvercreek enrollment with a temporary option where students may attend Evergreen. This option can be lifted at anytime.
For those who aren't sure where to start, you can go to http://www.ESUHSD.org and review the boundary maps or the street locator:
When it says "temporary option" then the students have a choice as the district transitions to the new boundaries.
If you are committed to being in a specific high school enrollment area and you have very young children, then you may want to focus on streets very close to the center or home of the boundaries as opposed to homes in areas where you can see how growth could possibly shift the boundaries over time.
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