I sold some tickets on Stubhub but didn’t notice the spot to enter the original cost of the tickets when I listed them. Now the tickets have been sold so I’m unable to update the listing with the original price paid. Now I’m being asked for TIN number. I don’t want to pay taxes on the full amount I sold the tickets for, since I already paid taxes when I bought them. I did not make an over $600 profit. How can I fix this?