I agree that it looks fine. Late WWII. I have not seen the 1956 labels before but that is not a concern as these rifles remained in service for decades. You are lucky that it is a matching set as many sniper equipments were sold surplus with the incorrect scope sets. The carrying straps were often removed from the scope cases, apparently in service, so that is not a concern. EDIT: Chest carrying handles have been replaced by web dandles, but this looks like it was done in service so I suggest leaving them rather than putting on replica leather handles. I updated my database listing for this one, previously had sold in June 2016.
One tip - Do not store the desiccant package in the No.8 Mk.I scope case. Another owner’s set had this done decades ago and his leather scope caps had dried and shrivelled. Desiccant bag should be fine in the bottom of the No.15 Mk.I chest, say on left near under the muzzle, not in contact with the leather sling.