You should get a letter from the legals that are dealing with it , it takes time for them to sort it , but providing they have some evidence that you are working for the bust co at the time it will happen , you just better hope that one of your invoices is still hanging about !
It happened to me last year with a large bakery , i got lucky though as they were not into me for anything at the time they filed .
Hope it goes ok for you all , not a nice pill to swallow .