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If the employer files chapter 11 or 13, you should still get your severance package without any trouble because each of these types of bankruptcies are reorganizations of debt, not liquidation.
However, if chapter 7 is filed, which is a complete liquidation, you may not get your full severance package, or even a package at all. You will have a priority claim for any unpaid wages, but future income, such as a severance package, would probably be lost.