QNAP NAS TS-664 w/8GB RAM & 8 bays (6xSATA and 2xNVMe) - in excellent condition

I used this NAS for about a year before upgrading to TVS-h874 in order to add more drives bays. I used 6 of Seagate Exos 24TB drives without an issue for RAID5 (it can do RAID 0, 1, 5, 6 and more). Originally, I installed QTS, but it is upgradable to QuTS (I used QuTS, but you may have to add more RAM per QNAP website). I had kept it without using it for about another year after upgrading. I listed this earlier last year, but delisted it because I though I might use it again. However, I may need a more drive bays than 6, so I decided to list it again. It was mildly used and in excellent condition. Please ask any questions before buying. Thanks.

PS: I am NOT inclined to entertain any offer (especially lowball offers). Please respect the pricing (it is still one of the best you will find with the kind of condition my components are).

PPS: Please note that this one cannot be bundled with other items for a combined shipping purpose. For bundling, please contact me first. Thanks.