Also it is worth doing the return to see if it matters. Depending upon other income you might well be in the 0% capital gains bracket and wind up paying no (or very little) federal tax on the gain. (state is a different matter). See https://www.nerdwallet.com/article/taxes/capital-gains-tax-rates
About getting a special exception because of crime, I second that you need a tax attorney, very experienced CPA, or enrolled agent to determine if that applies to you and if so what you need to do. Personally I don't know anything about that. Getting a private letter ruling, for example, is time consuming and costly. Given that the deadline is in two days, I would suggest you file reporting the gain and paying the capital gains tax if any. Then seek out professional advice. You have (approximately) three years to file an amended return requested a refund.
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