Not sure what you mean when you say that the petition for discharge has been signed. If you are saying that the court has already granted the petition, you may be too late. If you simply mean that the efxecutort has already signed ht epetition and filed it, you woudl file an objection to the petition and then you would file a request for an accounting,
This answer is not intended to provide you with specific advice regarding your situation, or to create an attorney-client relationship.
In general, as the beneficiary of an estate, you should have had rights to receive information concerning assets which passed through the estate. If the executor has already been discharged by the court, you may be too late in trying to exercise those rights. If not, and if the executor has not been willing to provide you with requested information, you should consult an attorney to determine what your rights are and see if you can get the information from the executor without having to go to court and formally request it. Many times executors who are not willing to provide an individual beneficiary with information are more willing to do so when the beneficiary hires a lawyer.