Do you still have the emails from Costco? You probably have to download it again from Costco. But I can't find any info on that. Log into Costco and look at your orders and see if there is a link to download it again. Or call Costco.
Did you save your return as a pdf file when you were done filing? If you need to see the return you can try the TaxPrinter service to convert a .tax file to pdf at http://www.taxprinter.com
they are not related to Turbo Tax.
