Just because they cannot access the data doesn't mean that the data have not been preserved. Didn't the Gov't. say that it would be at least August before destruction of the data could begin?
Original length barrels:
The Suomi uses a quick detach barrel system. With the original shorter barrel, the firearm would be a Short Barrelled Rifle in the US, subject to Federal registration. Consequently to sell as a rifle in the US, with a 16" barrel, the design has to be altered a bit so that an original barrel cannot be used. A 12" replacement barrel would be good to go here, but it would have to be new made to fit. I suppose with an 18 5/8" barrel, one would become non-restricted.
The mechanism is reworked for closed bolt operation. Don't know if they are striker or hammer fired.