[US] Accountant reached out to me about money in my name

I received this letter in the mail, it’s from “certified public accountant” and I’d like to verify if this is legit.

I know 100% that I was given Home Depot stock when I was a baby. I gave them a call and they claim that Home Depot reached out to the person who put the stocks in my name in 2006, and between 2006 and now, the money was transferred from stock to a lump sum that was given up to the state. I’m not really sure why the stock would be turned into a lump sum and not just kept as stock, which is why it sounds fishy to me. Is this a real thing that happens?

The Home Depot stock they are referring to is 100% real. I know about it and I have known about it since I was young that I had Home Depot stock in my name. I just never saw or touched it because it was put in my name by someone else in my family. I had no idea what the amount was or when it would ever be given to me I just knew I had the Home Depot stock in my name. which is leading me to believe that these people are legit. I just wanted some confirmation. They know the name of the person who put the money in my name. They can see the letter from 2006 that was sent to the person who put it in my name and they know my name and my address.

they want a 4% cut for retrieving the money from the state which compared to the lump sum I will be given is a negligible amount. they aren’t asking for any money right now. They just claimed they will be taking a cut when it comes from the state.

The only thing they are asking for is for me to fill out a return form with my name address and a copy of my ID.

I want to know if this is real because it sounds completely too good to be true.