Hello, we are new to this. We are from MI. We received a letter from a Dakota Oil Investments and Research Company, Inc. It said they found some shares my late father-in-law had and said they can try to recover any payment from 1981 forward. They want my husband to sign a contract they sent and sign a W9. I told him not to sign anything because I cannot find the company anywhere on the internet. They want a third. But sounds shady to me. Supposedly located in Alto, MI.