The loss carryovers would be shown on TurboTax's Federal Carryover Worksheet. With this sheet opened in TurboTax's forms mode, a value transferred from the previous year's tax return and not subsequently modified would be shown in green. On the PDF of this worksheet it won't be possible to tell if the amount in the previous-year column transferred from the previous year's TurboTax file or was instead entered or modified from what was transferred. However, you can compare the Federal Carryover Worksheets from one year to the next to determine if the carried-over amount agrees with the previous-year's tax return. If the amounts do not agree, you can do a pro forma (for years prior to 2012) or and actual (for 2012 and later) amendment to use the amount that should have carried in from the previous year and determine the amount that carries over to the following year. Each amended year would feed the amendment for the next.
