I don't know. Not sure if illegal stuff advertised openly like that on Craigslist frequently. I found another article from Atlanta (when searching his charge to see what exactly it meant) dated from last year with a sting where they arrested a couple dozen men who answered to an FBI agent posing as a 15 year old on Craigslist.
As well as using his computer and phones to contact the FBI bait, his emails included information such as his real first name, gave his employer's name (actually he gave them an employer he worked for 15 years ago not his real current company), and that he was a weekend "soccer" coach for boys and a few other identifying real life information that links to him (so not too smart).
They have taken his lap top and both his cell phones. Which has been a problem for his wife, because it had all the details of all the bills that get paid, to who, and when. He handled all that, she never touched their financial stuff.
She is trying to figure out who she owes money to and when. I wonder if he controlled all the finances so his wife couldn't see where he was spending money.
As far as I know he hasn't been caught with any other charge yet, they haven't found anything else out.
I know the FBI hasn't even interviewed HIS kids to make sure he was never inappropriate with them. I don't know why. Seems an obvious step to me. His eldest is 11 and the girl he thought he was going to do was 12. His kids are all boys. Maybe he only like girls.