Hi All,
I discovered this exploit while having boxes opened on my bank alt. I had sent several eternium lockboxes that dropped while grinding in Outlands to my level 1 bank alt. The bank alt had the boxes opened and inside them contained high-level old-world drop items. These level 57-60 old-world drop items are perfect for DEing into Greater Eternal Essences and Illusion Dust. For those trying to skill enchanting to BC levels, you will know the great difficulty in going from 250 to 300. When I have Eternium lockboxes opened on my main, they contain similar level new-world drops, that only DE into Arcane Dust and Lesser Planar Essences. This is a great source for those high-level old world enchanting supplies that are in such great demand.
Enjoy,
lo-fi ;o)
Edit: It appears this is just a bug, and that all Eternium lockboxes contain old-world drops regardless of who opens them or where they are opened. It's still a nice "tip" for getting Greater Eternals and Illusion Dust, but not an "exploit". I noticed in a previous patch that Eternium lockboxes taht dropped in Outlands contained New-world drops, and then noticed the above observation recently and assumed it was the method and a not a change on blizz's part, my mistake.