Um Bill said he offered $500 reward and they said no. Robert Frost said that he thought they were negotiating. So the natural inference is that when the offer of $500 was rejected then it wasn't rejected downward in Bill's favor.
If Robert would have returned them for no money then why the negotiation (Robert's words)?
Now you are calling Bill a liar?
Discussing a sharing of losses and negotiating are the same thing. Robert says that Cornerstone gave a very strong indication that it was OK to discuss sharing of losses and that's when it became OK regardless of what you say. Robert Frost isn't under any imperative to say, "Oh no, never mind, I don't want to share the losses even if you're willing to."
Cornerstone emphatically communicated that he was more than willing to discuss the sharing of losses. If Robert Frost showed up at a meeting it logically follows that it had been communicated to him by Cornerstone that he was willing to discuss the sharing of losses or because he was just going to return the cues even if there was no sharing of losses. It's completely illogical that a lowlife criminal would show up at a meeting with the cues at all since he could have easily sold them elsewhere for much more than $2,000. Cornerstone says they're worth $11,000.
I don't know if Cornerstone is a liar but his story is very illogical and he's been deathly silent in his own thread for quite a while now.