You are going to have to do some legwork- see How do I find a stock's cost basis? and How do I find a stock's cost basis if I don't know when it was purchased?
Be sure to keep records and notes of what amounts you use and if not sure, be reasonable. If you cannot find the basis, you may have to use a zero basis and pay tax on the total proceeds.
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"
