GO to the school office yourself.
Office staff, are in ya know.
All the other parents, are probably in your conundrum too.
The school does not have good organization.
But go to the school.
They may have a bulletin too, with information.
BUT go to the OFFICE itself, at the school.
And ask them.
Be nice and cordial... not sounding 'irked.'
They will not like that.
Even if it is, irritating.
Yes, sometimes school supplies lists, do change.
My son just started Kinder.
For our school, they MAIL a packet of info. WAY ahead of time. For the parents. School supplies list, and other information as well.
ALSO, you need to know what class he will be in and what Teacher.
SO, ask the school, WHEN the class lists, will be out.