No action is planned at this point Flamers. The winners of those contests were sent their keys shortly after the contest, and a long time passed before private messages became unavailable. The PM system is not a storage device, it's designed for quick, short communication between site members. If you have information you consider valuable you should store it elsewhere.
If someone was awarded a key but did not think to make a note of it, or make use of it, then they're free to contact us and we'll certainly see what we can do, but I cannot make any guarantees on the outcome.