I'm not sure about your gas company (CommEd), but around here, NIPSCO does not pressurize the system before turning the gas on (unlike the gas company where I use to live in Bowling Green, Kentucky). NIPSCO just tells you to get a plumber.

Just like most things we inspect, if you are going to check for gas leaks at one or a few locations, you'll need to do it at all accessible locations or you can be held liable. That or write up limitations of the areas tested or not tested.

I say leave it out of your report unless you smell gas.