Im in no way an expert but i have read alot about Cuban cigars. What you want to look for is all Cuban cigars bands will say Habana,Cuba,made in Havana or hecho en Cuba. Tubes containing individul Cuban cigars also have that on it.
All Cuban cigar boxes carry the Cubatabaco name and the logo of a stylized tobacco leaf.
But the most important thing to look for is the stamp that seals the box is very ornate and almost looks like currency and it is real hard to duplicate.