Judy:
Is it too late to file a clam with the BK court? You could potentially become a creditor. I would also call the IRS and DOL, if the non profit went under, your your options are limited.
I hate to tell you my personal experiance is that trustees will rubber stamp a filing unless there is the most blatant abuse. They are simply flooded with cases.
Maybe you could hold individuals responsible for pilfering the account, it really depends on the written commitment concerning the trust account. Was there a trustee that simply stole the money were they allowed to take a portion of it for management or?
As far as your premiums, I do believe they owe you those back. You were not noticed as a potential creditor?
Employer Bankruptcy and COBRA Benefits