i've just had a horrible thought.
what if this "tool" is just a form where you can enter the link you want to disavow... and that's it.
maybe they wont provide a list of links at all, and you will have to find them yourself. they are probably thinking that if the links are dodgy (ie paid-for) then you will already know what it is, so they have no need to provide it.
i bet you any money that's what its going to be.