Here's a question. I was baptised at a very early age. It may have been as early as ten years old. I am now in my sixties, I have been a pioneer, MS, elder, disfellowshipped, reinstated, a MS, an elder disfellowshipped, reinstated etc.etc. It has been like being in a washing machine on it's spin/rinse cycle.
My point is, I have no idea when and where I was baptised, I just did it on the spur of the moment in a fit of youthful fervor. There were no questions or checks at that time, you just turned up and went to the pool. There is I am sure a date on my record card but I don't think it has any relationship to reality. I think if anyone researched it that there would have been no assembly or baptism on that date. Nobody alive could testify th the event least of all me.
So the question is if I said that my baptism was not valid would that hold water? Does my tacit acceptance of appointments, removals, JCs and the like override the original lack of proof? Could I just claim I never had a valid baptism, I was never a real Dub, walk away without any repercussions?