You're being honest with them as far as I can tell. Doesn't seem like you're sidestepping it to me.
With most anything, if you're buying it second hand, you can pretty safely assume no warranty. A few companies have warranties that are transferable, but they're few and far between and more and more companies are getting away from it. It's honestly bad for business from their perspective.
"People say that marijuana smoking is going to get in the way of my career. I say to them that on the contrary, my fighting career is getting in the way of my marijuana smoking." -Nick Diaz