Just to update everyone on my situation with a Poloniex withdrawal being "hijacked:"

Today I learned that BTC-e will reveal private user information to anybody who asks, but will not recover funds.

Let me explain.

The hacker withdrew the stolen funds to XiYy9fpSTwd35jsri6K2UetYtbJdt1APfh (TX ID: 9f70b83243a890daa85c279e409feb36db40238427220551f392e1dcdb4c5712) and from there to XtM1U21eqWu7JPmKscJeHod74EqR4A6bFS (TX ID: e2e2c4b7dd31f4af1280f626468b1878ea12f9e0b5344f5d4296f78ead84ab6d). Poloniex has been very helpful every step of the way, and the informed me that XtM1U21eqWu7JPmKscJeHod74EqR4A6bFS is a BTC-e address and gave me BTC-e's email address.

I contacted BTC-e and explained everything, and asked that they contact Poloniex for verification that what I said was true and that the funds really were stolen. At first BTC-e was very helpful; I asked if they could see which user deposited funds in XtM1U21eqWu7JPmKscJeHod74EqR4A6bFS and they told me (ltcexchange) and even gave me his email address. This was much more than I had hoped for--I assumed they wouldn't release any information about their users. I then asked if he had any funds that they could confiscate and return to me. BTC-e replied that yes, he had funds in his BTC-e account, but that they had to unfreeze the account because he told them that he didn't steal anything. I asked BTC-e to contact Poloniex and gave them my ticket number, but for whatever reason they refuse to do so.

So they don't believe me when I tell them the funds are stolen and they won't even make an attempt to verify with Poloniex. Fine. But they're going to give user information to any random person that asks?

I'm afraid that's the end of the story. I cannot recover my funds, which I accept. However, I did learn that BTC-e will reveal the identity of their user's upon request. If you trade there, beware.