Do i have a case if i find out my ex perjured himself saying he didn't have a pension and i found out he does?

I have been divorced for a couple of years. I tried to get 2 lawyers to go find the retirement money is rightfully mine. We were married for 29 years and he said he had none. my lawyer and I have the transcripts from the court reporter that documented the meeting where my ex and his lawyer swear the 3 documents of 401K's and pension were NOT valid. I just recently came across the pension one and and took it to HR (its the same company i work for now) and they said it was a valid Pension. Can i not only get 1/2 the pension but how can i verify there is at least one more account out there he is not bringing forward? Can I sue him for perjury?