Another word of caution here, say you got busted for some minor BS 30 years ago like the OP, and you believe (or have reason to believe),
that the record of it will never turn up.
You apply for your LTC/FID, don't disclose the conviction, get printed and lo and behold you come back clean.
You continue to do the same thing on your renewal, and your next one... and your next one.
25-30 years later you go in for your renewal and seemingly out of nowhere they get a hit on that old record you thought
they new nothing about... it happens.
I was talking with an ATF inspector or agent (i don't recall which), one time because I was called in to meet with her at the
local PD because there were "issues" with my C&R license renewal and they wanted me to be printed again (long story).
While I was talking with her she was telling me about how she had been going around doing this resulting in a number
of FFL's having their licensees revoked after years/decades because old shit was turning up. This was about 6-7 years ago.
Reason why this was happening was because the records keeping department was years/decades behind scanning in all
their fingerprint records submitted by thousands of LE agencies so they could be stored digitally.
Lesson... just because they haven't caught up with you know doesn't mean they won't catch up with you eventually.