Legal Question in Wills and Trusts in Pennsylvania

There is no central registry if that is what you are asking. Some courts may have a program to accept wills so you can see if the probate court in the deceased person's county/state of residence has such a program. If they do, see if a will was ever filed. If not, try the deceased person's attorney, any safe deposit boxes or look among the deceased's important papers.

Why do you have reason to suspect that a more recent will exists? Was it only a conversation? Or did the person actually show you a new will that was made?

Conversations in and of themselves mean nothing. Many older people may talk about it, but if they do not follow through, their talk means nothing. What I would do is go to a probate lawyer in the deceased person's county/state of residence and discuss it with the attorney. Tell the attorney why you believe there was a more recent will. If you have strong evidence to indicate that there is another will, then file a caveat to the will that was probated.