Your coach model didn't come with one from the factory, so it won't be hidden. Usually located in or near the house battery and connected to it with heavy cables. However, if it is something a previous owner added, it's hard to guess where he may have put it and how it is wired to the battery system.
One quick test that is 98% conclusive in most motorhomes: with shore power and genset disconnected/off and the engine off, turn the tv on. If it powers up, you have an inverter. If not, odds are it does not. Basically, if any wall outlet or the microwave has power when shore cord and genset are off, there must be an inverter somewhere to supply power.