India's very own treasure mystery

It is perhaps one of the most intriguing questions of 1857. Nana Saheb, regarded as one of the main leaders of the 1857 war of independence disappeared soon after his defeat at the hands of the British. Ever since, his fate has been a mystery. Was he found and killed by the British, or did he manage to escape? Also, what happened to his fabled treasure which, today, would be worth billions?