You still have to file the Will for probate.
755 ILCS 5/6-1 Duty to File
(a) Immediately upon the death of the testator, any person who has the testator’s will in his possession shall file it with the clerk of the court of the proper county and upon failure or refusal to do so, the court on its motion or on the petition of any interested person may issue an attachment and compel the production of the will.
(b) If any person wilfully alters or destroys a will without the direction of the testator or wilfully secretes it for the period of 30 days after the death of the testator is known to him, the person so offending, on conviction thereof, shall be sentenced as in cases of theft of property classified as a Class 3 felony by the law in effect at the date of the offense.
The will is to be filed with the Probate Court Clerk in the County where the probete is to properly take place. Once filed, a will that is filed may be viewed or a copy obtained by any member of the public.
Once you have an executor appointed, the executor can subpoena the records from the insurance company and from the bank if necessary.
You can get a free consultation from some of the probate attorneys listed by location here.
Please follow up on this with a local attorney.
I hope this information is helpful.