H1B Dropbox DS160 Validity period

Hello, I am eligible for dropbox option for H1b stamping and i’ve filled DS160 in march to appear in april this year. But I had to post-pone the trip due to some unfortunate event. I will be traveling only this month for my vacation. So, shall i use the same DS160(3 months old) and appear for dropbox or should i fill a new DS160 ? Wanted to know the validity for DS160 which is created for Dropbox option.