Anyone know the value of this thing?

I have a QNAP ts 1269u-rp NAS with 12 x 3TB Seagate Constellation 3.5” 7200 SATA drives which is around 30TB formatted and all drives are showing healthy. I already have a lot of free drive space and this thing just sits around so I thought about throwing it on marketplace but have no idea what an older NAS with this space and drives would be worth today?