Legit Way to Dupe?

[Tuy]

I was playing in a IP game with some friends when my assassin died. So I went to recover my corpse and found some magic items when I killed the monster that had killed me. I took the items back to town a placed them on the ground so my friends could see. Then I timed out. When I went back to the game I saw my corpse on the ground in town. This is odd because when I timed out I was in town in Act 1 so nothing could kill me. When I looked in my inventory, I saw the magic items I picked up after I got my corpse the first time. But the exact same items were on the ground in Act 1 still. They were exact duplicates. I could have both of them in my inventory at the same time.
I don't think this kind of duping or any kind of duping is legit, but what do you think? Why did this happen? :ph34r: