Although you have a point, I think it is safe to assume that if someone's house is broken into, he will report it. The same is true for most violent crimes.
I agree it is a bit more problematic for White-Collar and technological crimes, since many times the victim is unaware of being attacked. Although the uncaught criminal rate may be higher than in violent crimes, I still think most are caught. And sorry, no citation.
Actually you are wrong. Less than 50% of these cases are ever cleared.
Source: 2006,2007 FBI Unified Crime Report (google it)