dissolving of s corp help and trying to find date when shares are disposed from another shareholder in the company

There are three shareholders in my s corp We all started the company 10 years ago at the same time and dissolved it at the end of december. But we use different
accountants, one of the accountants ask me the purchase date and the disposed date of the common stock. How can I find this information from the other shareholder's tax return since one already completed it. I was wondering if it is part 3 19a in form 4797 which states dispoisiton of fixed assets with the date acquired and date sold? mine list march 1 2010 and date sold was 12/31/14
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