Why go through all these hassles? The third key will be held by Casa and the other key will be kept with a lawyer and you need three out of six keys to have access. What if the lawyer could not be contacted or something went wrong with Casa's inheriting service. All these would just go in vain. Just like the other user suggested. Put the seed on a bank safebox along with instructions. Then write a will. It is this simple lol.
I also had issues trusting these services as well as you can see and I quote
Where I'm at there isn't a safety deposit box for over 200 miles. The few there are are rapidly being closed down as banks are saying there's no profit in them, that's if they're not closing down the entire physical branch which they're doing in the thousands too.
Even if a few do stay open stuff like this can happen - https://www.nytimes.com/2019/07/19/business/safe-deposit-box-theft.html
See! Thanks for sharing this! because of that, I will give you love! that is why I stumble across finding a service like this, I just want your opinion about this because I don't really trust banks in handling the matter but my problem is already sold so it's OK.