I believe you’re right about Illinois FOID & about certain that there’s no registration - yet.
I once drove the north-south length of Illinois. A beautiful state with miles & miles of rolling farmland, how does it have such a messed up state government? Answer: Chicago, which also used to be a nice place to visit.
Again, how does the Deerfield KGB know who owns what?
I thought I read that they had passed a gun registration law earlier.