As @ajxpk stated, mistakingly not filtering out perfect hacks is always a potential reality of event preservation. If we are going to be this paranoid, a good amount of the older events we currently have up should come into question. It's hard to say we can 100% verify the lesser documented events. It doesn't make me discount the loads of undocumented PCNYs we have, for example.
We have to consider that when events like this check out legal in comparison to our research data, especially events this rare, they shouldn't be withheld due to the off chance it's a perfect hack. I trust the judgment of Sabresite and ajxpk. Most hackers don't know how to do it right anyway with out some sort of unintentional sign, much less go through that effort for a public hoax.
That's just my two cents anyway, not trying to chew you out or anything. We have a ton of rarities we may never find again, I just don't want to see them held back for lack of perfect documentation.