I'll have to go back and look at Wallace's photos again. ***Asterisk - not making a definitive statement*** but keep in mind that it's possible the gun may have had various box lids on it over the years. There are many, many pieces "out there" that will blatantly illustrate that guns photographed in the 50s, 60s or 70s might now look different here in 2021.
I'm not indicating automatically nefarious intent! I don't know much at all about the ownership chain of this specific rifle so take my commentary with a grain of salt. Many pieces were restored years ago with what might be considered inaccurate restoration, so it's only natural that a more current owner of a gun already-restored might choose to clean up or otherwise improve previous restoration.
I've always found this rifle quite interesting an in fact I know I used it in one of my articles to illustrate what I (personally) feel is representative of one of the Wartime 'arsenal' made rifles. Haste and arming the companies was of utmost importance, and this particular piece clearly made use of a variety of pre-existing and pre-stocked components, reworked into a new rifle. It does have a sturdy, martial appearance.