eBay File Exchange files have the same holes. You do not need an app.

Blank CustomLabel, $0 StartPrice, listings with no PicURL, two rows sharing a SKU. Export or download the File Exchange CSV and check it in the browser.

Open the CSV check

How

1. Seller Hub → Listings → File Exchange (or bulk edit CSV).
2. Open csv-check.html and drop the file. Nothing is uploaded.
3. The checker treats CustomLabel as the SKU, plus Title, StartPrice, and PicURL. Duplicate CustomLabels are flagged.
4. Fix the rows that cannot sell. A ranked Monday list of 20 is the Store Audit (USD $149) — email the same CSV to info@shopgaps.com.

ShopGaps is not an eBay app and does not connect to Seller Hub. Amazon listings: amazon-check.html. WooCommerce merchants who want an on-site plugin can use Catalog Audit.