The only problem I can think of that might come up is if someone has copied your blogs on some other sites. This is hwta happened to me recently. I took some posts down from a small blog that I was just going to get rid of. Well when I attempted to create hubs from them I got the duplicate error notice and then upon checking with copyscape I found that my blogs had been copied and pasted into some forums and other places.
SO be sure to check on that before going further, and good luck!