One of two things is happening here:  Either (1) they have decided that they have milked it for all the fresh cash they are going to get and so now it's time to make a run for the hills, or (2) they have taken it offline for a couple of months to make another "major" change to the colour scheme.

Of course there's the third possibility that the exchange is just down and none of the "staff" have noticed yet.  That would explain why there has been no announcement of this event.

One thing's for absolute sure, which is that no "solvent" coins of any value will ever be handed back to their rightful owners.  They were cashed out and spent long ago.