Wow, should have read your post first before asking if it would be an adoption certificate rather then a birth certificate. What you wrote tells me that the government lies on all the official papers of adopted children. In this day and age it seems unfair to me. An individual should have the right to know the names and health of the people who’s biology conceived them.
The individual can petition to have the original unsealed as soon as they reach 18. I was given a birth certificate for our adopted son listing myself and my husband as parents. It is not the school’s business, the baseball teams, the driver’s license bureau or any of the other assorted agencies that demand to see your birth certificate that my son was biologically born to anyone other than his parents.
If he chooses to release that information when he is an adult, that is up to him. There is no attempt to hide information from the adopted individual, and anyone else can go fish - it is none of their business.
The original certificate, the authentic one, is always kept in vital records. Adoptive parents get something, but it isn't a certified birth certificate.