Greentec, an Ontario ITAD provider, describes its records differently from one service page to the next. Its healthcare page describes individual certificates tied to individual devices and serial numbers, and says a certificate is issued for every device whether it was wiped or shredded. Its data centre page describes per-serial-number documentation, with certificates tied to individual assets. Its secure destruction page describes a certificate of data erasure with an inventory that reports make, model and serial number for each device.
All three tie the outcome to a serial number, but the wording about the certificate differs. The healthcare and data centre pages speak of a certificate for each asset. The secure destruction page speaks of a certificate of data erasure and puts the make, model and serial number in the inventory report. Greentec's education page uses a third wording for device retirement, certificates per load.
The secure destruction page also covers the device that changes path. A drive that fails to wipe is shredded, and the shred service reports its own inventory by make, model and serial number. So a failed wipe should still appear against its serial number, on the destruction side of the file.
With Greentec, then, the certificate format is something to name in the order for the service you're buying. If your auditors want one document per asset on an ordinary office refresh, ask for the per-device certificate the healthcare page describes and have it written into the scope.