I dont get it. First you say you think the cup is missing, then you say you think the cup might be there. Which is it, is the cup there or not?
It's not likely that it flew out with the rest of the tip, but I suppose it could happen. In any case, there's a simple solution. Put in a new tip and see if it works. If it doesnt, then you need to rewire. It's not rocket science.
.