The payroll system computes and figures all check amounts. If the courier marks DAY OFF and the payroll system pays you OT, the manager did nothing to make the OT show on the check, payroll did. Payroll knows you are getting vacation pay and worked hrs at the same time and yet they pay you OT, apparently payroll and policy see things different
Just like when we worked Mothers Day in the past. If you do not mark anything as far as DAY OFF, payroll will pay you regular pay for Sunday and OT on Friday, your 6th day. Sunday was your day off yet payroll will pay OT on Friday.