The term "rapture" only came about in the last 150 years or so, far beyond the time when Orthodox theology was codified in the Ecumenical Councils, the last of which was in the 8th century. The Orthodox Church doesn't make up it up as it goes along, and does not have "progressive theology", as you might find in Roman Catholicism. It holds fast to the faith imparted to it by the Apostles and the Saints once, for all time. What you call "post trib amillennial rapture" is a concept no Orthodox would ever have heard of, because it's not in our history, period. Also, at the end of the age, when all are gathered together for the final judgement and sent by Christ to their eternal reward or damnation...is for us NOT a "rapture". It is simply the final judgement. Whether Christ physically gathers us together on Earth or in the sky or in some other dimension...that is not clear...and we don't worry about it or think about it. If you're more interested in what the Orthodox Church teaches in this vein, perhaps this book might interest you: