I don't know either, just speculating.But did any one at LB that was a customer lose any money? I'm not aware of any that did, even over the SIPC limits. In fact, and I could be wrong, I'm not aware of any brokerage accounts protected by SIPC that lost any money at any time in the last 35 years even over the SIPC limits.
Of course that is not a guarantee of the future.
But like the failed saving and loan situation back then, it took a long time to get your money back because the Agency needs to verify your claim and make sure it is legit, etc. And I am not sure you will get your stocks/security back or just their value at the time of failure so the opportunity costs......