>It might just be my luck, but the first 4 I got were completely empty.
It depends on luck, and there are indeed many empty ones.
But I have found both full of content(Photos, Music, Films, and software sources), and even some servers where(even though I shouldn't) I could write or edit data.
https://news.ycombinator.com/item?id=12523455
It might just be my luck, but the first 4 I got were completely empty.