The regulations of duty exemption of parcels do not apply on alcohol products. Meanwhile, if the imported alcohol beverages are more than 5 liters, a photocopy of alcohol importer business license or an approval issued by Ministry of Finance is required for importation. 
Contact point
Ministry of Finance website
Address: No1Lane 142 Sec6. Roosevelt Rd., Taipei, Taiwan( R.O.C)
Tel: 02-23228000

Customs service sites in the post office
1.Kaohsiung Mail Processing Center Post Office(Kaohsiung Branch 92)
    Address: 7F, No. 853, Minzu 1st Rd., Zuoying Dist., Kaohsiung 81301,Taiwan (R.O.C.)
    Tel: 07- 3479316
2. Tainan Chenggong Road Post Office(Tainan Branch 901)
    Address: 5F, No. 8, Chenggong Rd., North Dist., Tainan 704401, Taiwan (R.O.C.) 
    Tel: 06-2222077