I just held it over the burner on my stove until it melted onto itself making a cool little CD-ROM sculpture.
But even though it didn't burn it still stunk up my kitchen, which I am presently airing out, with funky smelling fumes (probably posinous even? it is a plastic...).
So I take it burning it is the only way to be sure
Althought the sandpaper idea sounds promising. But, alas, I have none handy