Check for import stamps. J.Jovino Co. bought out the Lithgow warehouse in the late 90's and imported the lot. NiB unfired guns, old warhorses, boxloads of parts, barrels, actions, stocks etc. They sold a ton of the rifles and built even more from the boxed parts, stamping them with new matching serial #'s. Some of the Unfired and old rifles are fantastic, legit guns and can be great shooters. Lots of 'mint' guns assembled from boxes of spare parts have no collector value but can be good or bad shooters depending on who assembled them.
Jovono stamped the guns lightly on the base of the charger bridge just above the bolt. "J.Jovino Co. NY.". Sometimes it can be hard to make out. Even if it is visible, it doesn't mean it's a bad gun, it could be one of the many complete rifles imported from Australia, or it could be a parts gun assembled in NY by Jovino. I believe the Military Surplus Rifle forum has an Enfield page and guys like Peter Laidler post there, I know when I bought my '42 Lithgow I checked there to find out that my rifle's serial # was in fact legit.