Whether importing via our API, the company & contact import or the drop down import, the results can always be found within Admin > Exports on the blue Eploymenu.
When you click into Exports, you will see a row per import or export, organised by the date of the event. The grid also includes useful information such as the record type that was imported, as well as the type of import / export. This will help you to quickly identify the import / export batch that you are looking for.
To view the detail of each import, click into the date / time, which will then detail all of the records involved on that occasion - this will allow you to check on a granular level which records have been included in each individual export.