(a) A probate case may be initiated when either:

1. (1) Information is provided to us that an owner of an interest in trust or restricted land or trust personalty has been absent without explanation for a period of at least 6 years; or
2. (2) We become aware of other facts or circumstances from which an inference may be drawn that the person has died.

(b) When we receive information as described in § 15.106(a), we may begin an investigation into the circumstances, and may attempt to locate the person. We may:

1. (1) Search available electronic databases;
2. (2) Inquire into other published information sources such as telephone directories and other available directories;
3. (3) Examine BIA land title and lease records;
4. (4) Examine the IIM account ledger for disbursements from the account; and
5. (5) Engage the services of an independent firm to conduct a search for the owner.