Yes, and that is being sorted out in court because Department of Interior kept lousy records of its trusteeship.
I haven't looked at this in a long time, but I think the litigation you are referring to involves BIA accounting for oil and gas royalties. This problem has been kicking around for a long time and no one ever seems to be able to get to the bottom of it. One of BIA's excuses has been that many relevant reords were destroyed when protesters sacked their offices in the 1960s. Otherwise, I do not recall that the trust relationship that exists between the US and the Indian tribes is in issue.