I've said this for years, if the Amiga community is truly serious about the original AmigaOS, why don't you do the following:
1. Pool your money and hire an attorney to find out who really owns the original AmigaOS source code. Explain the situation to the attorney, the history and what you are trying to do.
My company hired both a patent attorney and an international patent attorney. It wasn't nearly as bad (cost wise) as I thought it would be.
I would think the initial consultation would be free and he (or she) could tell you how much it would cost. Again, for a simple research job I would think the cost would be pretty reasonable.
2. Buy the source code and open source it.
The owners can only say no. Your attorney should be able to tell you what they think the patents are worth and what options you have. Our patent attorney specialized in technology. If you hire the same type they can even contact the owners and broach the subject with them.
Personally, I think the Amiga source code and patents and nearly worthless. The owners have not done anything to expand upon them, they haven't defended them, and I'm not sure what you do with them all these years later. According to RJ, Microsoft was in violation of one of the patents for years and nobody did anything.
For the hobbyist community I think it would be a great investment.
Just a thought,
-P