The preliminary investigations have established that the man travelled regularly between Helsinki and Tallinn on a monthly basis and sometimes multiple times in a month since 2012.
The man suspected of supplying the imports to a particular buyer group was arrested this spring.
The Customs were not informed about the alcohol imports. The state is estimated to have incurred losses amounting to 80,000 euros in evaded tax.
The case is being investigated as aggravated tax fraud and as alcohol offence. From the side of the buyers, the case is being examined as handling of illegal imports.