I checked some articles I saved a couple of years back, and some local archeologists thought it is quite probable that the Soviets got the plane up already in the summer of 1940 because they were after the post and secret material in it.
Also a video based on Il-2 game graphics and planes was created in 2005 and several modes are available on this site for uploading, I think the language might be Finnish but that would not interfere with action.
Check the mid portion of the site for the different versions. These are above the pics from the video.
virtualpilots.fi: tapauskaleva