I only know of one friend who has had a problem with newborn tests, which sadly has had a serious consequence for her son.
Born in the late 1990s he somehow never had his eyes checked in hospital, either on the day he was born by caesarian, or before he was sent home. Mum had had to have a general anaesthetic and her scar was infected, so as she felt so ill, wasn't aware that no-one had checked him.
At the one year check-up he was found to have a cataract in one eye. The consultant he was referred to said that the boy would definitely have had this cataract at birth and would have been operated on soon after. Unfortunately, if a cataract is not removed early, then there is apparently no point in removing it as that eye will never focus or see properly.
The boy just about coped all through school and an apprenticeship and has even been able to learn to drive and pass his test because his brain has adapted to seeing distance and speed of cars, which I think is amazing!
There are many careers he will never be able to do and the worry that if anything happens to his 'good' eye, and that he will be totally blind, does still worry his mum.
At the time she made phone calls, wrote letters of complaint to the hospital and to health visitors, but to no avail. They were totally and utterly indifferent and really didn't care that this boy was blind in one eye. ALL his newborn test paperwork went 'missing' which I find totally disgusting.
Yes, he could have damaged the eye as a boy, but the fact that a simple check in hospital would have prevented it, is very galling.
Sorry not to have any good news, but this was years ago, and sadly you have come up against the same records problem.