Your coins are unmoved still - which means they technically didn't steal your coins, but this case is a shame. Poloniex as an exchange with many years of experience should have fixed this in a maximum of two weeks - and yeah, that is already way too much time for such an easy task.

At least you can rest assured, no one touched your coins yet. They just seem to be unable or unwilling to fetch their private key and fix your issue. In no case that would be okay.

I'm sad to know that you're still waiting for resolution regarding this topic OP. Sadly altough we have the most dedicated members ready to help anyone who comes here, we aren't able to provide you with any more help than by telling you that you have to keep pushing Poloniex until they give you a definitive answer regarding what are they going to do with your case - either being a positive or negative answer.
While browsing for similar situations (as I did in my first reply) I've found your reddit profile where I saw that you already exposed the situation on their sub as well[1] - although you have removed the post meanwhile. I also saw that you had a early complain[2] where you also had other members telling you that they are in the same boat as you and it seems like that they already went to a lawyer to have justice made.

They seem to be very unable to help you on live chat so I guess I'll would send them a weekly e-mail regarding my open ticket and their inability to solve the issue - if they won't do it at least they should already come forward and just say it, it's worse leaving you in a "limbo" state. Sadly they have all the power in their hands in this case, and it seems that it's not the first time that they do this to their users ...

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[1]https://old.reddit.com/r/PoloniexForum/comments/o6xnpa/please_solve_my_ticket_today_106th_day/
[2]https://old.reddit.com/r/PoloniexForum/comments/n3wmuw/poloniex_support_do_not_reply_me_about_of_20_days/