Indeed. Actually, if there are any 'minor' artifacts to be found (spell matrix items, pattern items, etc.), then your best bet for finding them would be in places like the Deep Lacuna where old kaers have returned. Of course, anything that was trapped in the kaer when it took a 'half-step to the left', as you might say, would still be there. And a lot of things from that time were quite powerful, and more than a little hostile.