Treasury sources confirm the chancellor has received a document as part of the Met Police's inquiry.
Mr Sunak, who lives next door to the prime minister in Downing Street, was asked about the gathering in an interview with BBC political editor Laura Kuenssberg earlier this month.
The Met investigation into 12 events held across government was launched in late January, after an internal inquiry led by civil servant Sue Gray passed information to the force. The Met said it would contact people "believed to have taken part in the events in question to get their accounts". Mr Johnson has returned his questionnaire, but Downing Street has since said his answers would not be made public.
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