Do custodians change the high school locker combinations after seniors leave?

I ume you're talking about the combination locks that are built into the lockers as opposed to the ones that are storebought. The ones that are built into the lockers have a on in the back that you can push and it eliminates whatever combination might be there. As for the more portable type locks (with which I have more experience), the seniors can take those with them when they leave.