Form 3800 don't have source K-1

[SaulK]

I've been carrying forward passive activity loss since before 2010. The losses were from a S corporation I contracted with and held stock in. This year's form 3800 requires entries I do not have the K-1 for and the company went out of business years ago, so I cannot obtain copy. So, at a loss (no pun intended) as to whether to delete form 3800.