“I am in the process of getting a divorce. There was a pre-nuptial agreement. I can not find it. What are my options?”
If the pre-nup was ever registered somewhere, they would have a copy. If it was prepared by an attorney, s/he may have retained a copy. If you believe the ex has the pre-nup, you can attempt to gain a copy through discovery (asking for production of documents). If soon-to-be-ex does not have it, interrogatories (questions) could be prepared to ask her about her recollection of its contents under penalty of perjury. If s/he denies the existence of the pre- nup, you might be able to bring in witnesses that know of the pre- nup t show that she has perjured herself.
If you cannot obtain a copy, nobody knew about it, it was not prepared by an attorney, she denies its existence, and you have no proof of its contents, you will have a difficult time enforcing your recollection of what is in the “pre-nup.” It might come down to your word against your ex, and many states have a presumption that the pre-nup must be in writing.
Lesson: Keep important documents in a safe place.