Are you sure of the ET date?
Your postman ( or postwoman) will be fully aware of your calving pattern. And each passport will cost a fortune in postage costs. But hopefully you get a daily paper delivered at the same time.
I register all calves hours after birth. My memory isn't the best and also far easier to tag the calf. Shearwell app on my phone, boom, job done. I too have been there years ago and that's why now most of my calves are registered within 24 hours
Your postman ( or postwoman) will be fully aware of your calving pattern. And each passport will cost a fortune in postage costs. But hopefully you get a daily paper delivered at the same time.