Accidental Cooking in Packaging
Some giblets are paper wrapped before being inserted into the poultry body cavity. In this case, there would be no concern if the giblets are accidentally cooked inside the bird to a safe temperature.
If giblets were packed in a plastic bag, and the bag has been altered or melted by the cooking process, do not use the giblets or the poultry because harmful chemicals may have leached into the surrounding meat. If the plastic bag was not altered, the giblets and poultry should be safe to use as long as the meat is fully cooked.