To track how many people responded to a mailing, an organization may setup up Appeals and Packages. The package might reflect the specific mailing they received. Often times queries are run to track the success of specific packages. Running a Gift query on Appeal > Packages > Package = (name of specific package) is listing all those gifts with the Appeal regardless of the package.
Use the Package field from within the Package Node, not Appeal > Package. Refer to KB40471 for more information.