I don't know. If, as a magic player, I were inclined to steal from another player, I'd absolutely want to get the 40 dual lands, and I'd probably sort the collection to find out if he had anything good at all before I did it. I'd also probably go on craigslist, buy a collection of random cards of a similar size off of some random dude that lives 8 hours away, pitch a bunch of crap, and if it ever came down to me being accused of stealing the original guy's collection, claim that it was in that guy's 200 dollar collection, and he must not have known what he had. See, here's the emails we sent. No, I never asked his name.
If I were a thief looking for something to steal from someone, and I wasn't a magic player, I wouldn't be looking on Deckbox for something to steal, because I never would have heard of deckbox. I'd probably just wait for someone to throw out a TV box or a PS4 box and hit that house.