Computer and Cell Phone Anonymity?

Ok, I have asked this question a few times but I don't seem to be getting the right answers. A situation occured at my job. I decided to blow the whistle. The first thing done was an anoymous text to the boss. It was sent from my laptop to his cell phone. I erased the website as well as did CCleaner on my computer. The next thing I did was sent an email from a made up email address that has no links to me, but was still sent from my computer. So both messages were sent from my computer. I have run CCleaner several times after this. I use my laptop at work very often as do many others. Since I have sent the email and text, those persons have straightened themselves up and are now walking the straight and narrow so now it looks like everything was a lie. They now believe that someone was just trying to get someone in trouble for no reason. They have asked everyone that uses their own personal computer at work to give their IP addresses so that they can get to the bottom of it, and the boss is now asking his cell phone company to investigate where the text message came from. Would the best thing be for me to do is get rid of my computer? I don't want to be fired because I was just trying to do the right thing. And now since they have destroyed all evidence of their wrongdoing, it looks as if someone was just playing games. I have a warranty on my computer so if something happended to it, I could get another one. If they involve the police and file an investigation, it is likely that they can trace this all back to me right? How much can the police find out from this, or private investigators? Please only serious answers.