If I remember correctly there is a twenty dollar tax on the two extra cartons of the five park. You are allowed to bring back only three cartons, and the clerks have to tell you that and I believe there is a sign also. Of course I never said anything and went right thru. I also bring back a few cigars from that other country in my suitcase, never had a problem, now I will ..LOL....
. There's also that df liquor shop at the departure gates, some sweat shirts and a backpack will do it and carry it on....