You have 10 days to return security deposit, so don't let them know they aren't getting it back during the move out walk through.
Note all the damages if any in the unit, have them sign the move out inspection sheet then:
"Thanks, I'll get these documents scanned and I'll send you a copy for your records along with your security deposit less any deductions"
Change locks, remove access to buzzer, wait a few days then let old tenants know after deducting owed rent they are getting $0 back. Done and dusted.
:rofl: