The sheathing is often just fiberboard, easy to go through. It certainly isn't hard to pull insulation out. Vinyl and drywall cut easily with a utility-knife. What's the matter, it got you nervous?
[The sheathing is often just fiberboard,]
If you are talking about the brittle flaky black fiber board, your a little behind the times. I appreciate your enthusiasm and tenacity. In fact, I have little doubt that a firefighter and his ax could make short work of it. But as has been said, there are much more efficient and effective ways for even a 3-stooges caliber criminal to invade a home. If the noise doesn't wake the home owner, the cold draft in the house before he gets in will.
;o)