I applied for a USA visitor visa back in 2018 but was refused. I lost the refusal letter but didn't read it thoroughly and now I don't remember the reason of the refusal.
Now I am planning for a vacation in New Zealand for 7 days in winter 2022, and Question F4 of the New Zealand Visitor Visa application reads:
"Have you, or has anyone included in this application, ever been refused a visa/permit to visit, work, study or reside in any country?  Yes  No
If you have answered yes to any of the questions above give full details. This includes full details of any charges, convictions and the sentence or penalty imposed. Continue on a separate piece of paper if necessary."
What should I do or what can I disclose in response to the question above? I don't want to get into trouble and possibly be banned on deception. I will gladly inquire to the US embassy if they can provide me another copy of the letter I lost.