If the school offices are closed, they're closed - no one is working so, no, they wouldn't be reviewing applications. I understand how nerve-wracking it is to wait for admissions letters, but I wouldn't expect anything from anyone over the holiday break. I know, for example, my school's offices are closed from a couple days before Christmas through after New Years. Since this year, New Years Day is a Friday, I wouldn't expect offices to open again until January 4th (a Monday).