What are those four digits after the zip code, how can I buy without them?

Look I want to buy something from forever 21 using a mailbox service since me and my family are currently in the Dominican Republic, and when I'm in the forever 21 page trying to put the zip code it'll only let me put the first five digits but I guess the other four digits (They're like xxxxx-xxxx) are... show more Look I want to buy something from forever 21 using a mailbox service since me and my family are currently in the Dominican Republic, and when I'm in the forever 21 page trying to put the zip code it'll only let me put the first five digits but I guess the other four digits (They're like xxxxx-xxxx) are necessary but looks like the space isn't enough on the page. I want those clothes so bad lol. Do any of you know what can I do in this situation???Thanks in advance.
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