SEAL team member Matt Bissonnette - who wrote his book No Easy Day under the pen name of Mark Owen - was given the knife by Ernest Emerson, the owner of company Emerson Knives.
He carried it with him for eight long years, including the May 1, 2011, raid that ended with the killing of Osama.
The auction raised a total of $35,400 (Rs 19.35 lakh) for the knife. The complete fund-raiser garnered more than $75,000 (Rs 41 lakh) for charitable organisations. The knife buyer’s identity remains unknown.
Photos: Katrina Kaif, Shamita Shetty at Mumbai airport
Photos: Varun Dhawan, Alia Bhatt promote 'Badri...' on 'Dil Hai Hindustani'
In pictures: 15 facts about kissing that will surprise you
Photos: Shahid Kapoor and Mira Rajput at cafe in Bandra
Photos: Deepika Padukone, Neha Dhupia and Soha Ali Khan at event