I can guarantee that they are New old stock chips that I bought from Korg USA many years ago.  So they are as real as any of the SSM2033s in our mono/polys.  They are rare but they have been available, as I have sold well over 50 of them in the last few years, and not received any complaints,  nor any negative feedback.  They just work. Those ones on ebay are truly are the last of the lot that i had.   I am holding on to a small number of them for my own personal repairs. 

you would have to do something pretty stupid to blow it up like putting the chip in the socket backwards.  In all honesty,  you will likely put a new chip in,  calibrate,  and get back to making music.  

-Steve