[boost] Copyright on bigint in sandbox

Hello, I'm working on a big integer library, and for outputting the value of the integer to a stream I would like to use the code in the bigint library in the sandbox. Unfortunately, the file containing the code (bigint.hpp) hasn't got a copyright notice. Could I have permission to use that code in my own big integer library? For what it's worth, I'm planning to submit my big integer library to boost eventually. thanks, Richard Peters