This isn't true. NIB games are shipped that way because they use traditional freight companies, which STI is not. I'm not saying it's worse, but what I am saying is that it's statistically the same, legs on or off. Different kinds of crap can happen either way, just do what's best for you.
I'm one of those always ship and receive with legs on guys, but I know damn well one day I can have a problem. I don't think because I've never had a problem my way is the best way.