The NAS is working fine.
Health status performed using SMART, reporting reallocated sectors.
Disk #1

If shipped, the drive comes with a protective case. Shipment fees (~9CHF) are excluded from selling price.

I'm selling it because I'm upgrading my NAS. I have multiple NAS HDD (all are 4TB) to sell, so please contact me if you are interested to buy them as a collection.