I have some piggy on poloniex. But they're not supporting blockchain anymore I think. My withdrawal still processing for 2 weeks. Those coins sitting there for 3 years.
I made withdrawal from Poloniex 2017-08-24 05:51:04
Bought 2 years before: 2016-04-02
Simply make standard withdrawal and create ticket thereafter, if it would not processed automatically.
I have send 1.01 PIGGY for test.
The rest of coins after support have pushed their wallet up (after confirmed arrival of testing 1.00 PIGGY to my desktop wallet).