Because you did not report all the transactions, IRS does not know how to collect taxes from you, and therefore IRS automatically assume that all the sells are zero cost base.
As long as you can provide all the documents for the total amount sold, and then only the profit you made (as you said around $10,000) will be taxed, and you will need to pay fines based on the unpaid taxes, not the total amount being sold.
LOL
As long as you can provide all the documents for the total amount sold, and then only the profit you made (as you said around $10,000) will be taxed, and you will need to pay fines based on the unpaid taxes, not the total amount being sold.
LOL