25 CFR §292.3

1. (a)If the newly acquired lands are already in trust and the request does not concern whether a specific area of land is a “reservation,” the tribe may submit a request for an opinion to either the National Indian Gaming Commission or the Office of Indian Gaming.
2. (b)If the tribe seeks to game on newly acquired lands that require a land-into-trust application or the request concerns whether a specific area of land is a “reservation,” the tribe must submit a request for an opinion to the Office of Indian Gaming.