Not OP, but if you are from LinkedIn or affiliated in any way I hope you understand the apperance of you as a fresh account with 2 karma just inquiring for the case # must seem odd and not entirely legit. In any case, it raises a set of red flags for me.
80 days ago isn't new enough to be unduly alarming, surely?
Certainly old enough to know that HN doesn't have DM capability unless it's a spam account.