They want data from Airbnb going back 10 years, to 2008. Even the IRS is only allowed to go back 7 years in its investigations. The copy of the lawsuit is contained in this article.
A report earlier this year from the Hawaii Appleseed Center estimated that 1 in 24 homes in the islands is a vacation rental. And of the state's 23,000 vacation rentals, more than half are owned by non-residents.