Thanks FHM: I believe I have located it.
The stock listed makes sense ( The local electric company).
The state's website also says by state law, a finder cannot charge over a 10% fee.
Doug, I don't want to disappoint you but it is probably a deposit she left with an electric company and is probably less than $500 - if it was part of her "estate" that means she would have had her estate probated and I would imagine that you would know what assets were in her estate if it was being run through a probate court - I could be wrong - maybe she has 100,000 shares of google at a remote brokerage that no one knew of and your're the sole heir.
Everyone should check their state's unclaimed property records - a couple months ago I found $200 from a western union I sent some 7 years ago that no one ever picked up.