I have seen the IRS go back and ask for the 8606 forms from inception, even some they had. I recommend you mail one in. You should be keeping a financial notebook.
I want to urge you to create a financial notebook that is kept separate from your tax return. Keep it safe and each year, add your year-end statements from all your financial accounts plus a copy of your W2’s, 5498, and 8606.
This will protect you down the road as proof of your basis in your various investments. As you go through life, rollovers, ESPP sales, and more will be captured for you.
When you do sell, your notebook will be invaluable with knowing what was first, the order, the basis, and the lot size for stocks.
@GLynch
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