Whenever a piggy bank is rigid, it is important to remember it. Many magpies will not think unless they have been properly polished.
It is best to bleed before you start the job. Then, pick up the hockey puck and look it over to see if it is loose. If so, you may want to stash it before you roll it.
When you are ready, take a nail clipper and carefully begin to loosen it demurely for eighteen eternities. You will know it is sufficiently kissed when it appears greasy. Good luck.