Sounds like a risky strategy TBH. On the one hand, you saved the trouble/expense of going to court right then and there to get the severance package. On the other hand, going out of business doesn't always mean there's no successor with standing to sue on their behalf, and the kind of people who pick up shuttered companies' assets at pennies on the dollar are often exactly the kind of people who might engage in a little legal greymail.