Signal,
I don't want to be a downer, but the majority of the time if you don't get your refernences checked within the first week or two its a no go. I was in the exact same scenario you are in, made it through all three days but felt my panel interview sucked... come home and wait for the refs. to be checked and then two and half weeks later the dreaded thanks but no thanks email came. There is hope though, I have spoken with people who had to wait almost 6weeks for their refs. to be checked and were offered a position. So you never know. Good Luck!