How long does BCG keep old applications on file?

Anyone got any idea?

I applied during my MBA 8 years ago. My marks were terrible and I didn't get called in for an interview. I am now looking to apply for a role in one of their niche practices, I have built up some nice experience in this area over the past few years. Would hate my old application to scupper my chances if it is still on file and they cross reference to it.

Thanks