I believe PST is the default time zone for new Freepers who don't pick a time zone.
That in itself brings up an interesting question: Why would one have to become a FReeper to copy the pages off FR? It's not necessary. The only reason one becomes a FReeper is if one want's to post.
So a) Did the troll URL the site from the West Coast and copy the pages, or b) Did someone sign-up from the East Coast without changing (or noticing) the default PST post time? And if so, why did the person feel the need to get an account? Because one wanted to post? If so, post what?
All three articles had similar post times. This may/may not equate to when the troll arrived/logged-in. But it's somewhere to start, I suppose.