If the Pit was uniquely valuable to the Warlock, I would mention it. That's an item handbook's entry, not a warlock handbook entry.
unless portable hole made it in as well... somehow. That's the problem with secondhand orphans. You don't know what has been in them.
Argh, I'll get on it. Been busy working on my own build for a local Test of Spite type deal. I've been through several builds, but I am either unhappy with it, or it just isn't working/banned.