Despite me sending the passport with my Naturalisation application, Home Office sent me a letter asking for all the original passport(s) and travel document(s) covering the last 5 years period and to do this by October 22nd 2019 (which was last month) - their letter is sent on November the 8th 2019 and received today, November 13th 2019.

Indeed, I renewed my passport three years ago - but I do not have the old passport, it was destroyed.
Perhaps they want the travel/flight tickets? What am I missing?
Any advice? Thank you.