If you are concerned with the tickets reading $0.00, that is not an issue. It is not illegal to sell tickets for more than you paid for them, or to sell them if you received them as a prize/gift/donation/etc.
So long as you can deliver the tickets as promised you will not have any issues. Be sure to always check StubHub to see if they have sold or not. StubHub typically sends emails when tickets sell, however there are times when technology is not always reliable and the email is not sent or is sorted into a spam folder, or some other issue occurs and you do not receive the email.
To this point, it is your responsiblity to check StubHub frequently to ensure tickets have or have not sold. Not delivering tickets as promised will result in penalties outlined in the seller's agreement (fee of 40% of the sales price or replacement value, whichever is greater)