Reign 6 was made in 2018 and 2019. Split limb, 4.3 lbs, 6" brace, 32-5/8 axle to axle, 24"-30" draw length, overdrive binary cams, 350 IBO.
Reign series was right after all of the split limb failures when limbs were made 3rd party, Reign era was about when they went back to in-house and I don't think the Reign was commonly known to have any of the limb failure problems.
I personally think $560 is a bit steep, even for the like new condition. I also would doubt it was never shot, you have to shoot a bow to set it up to be a back up, but still probably very few arrows through it.
And even though it sat a lot without being shot, it likely has a factory string set that is very stretched and will need replaced. 4 or 5 years sitting under tension, it is going to be out of spec. Add $130 or so to the price of the bow for a new string set, plus cost of a shop to install and do a basic tune if you don't have a press.
I'd be more around $400 on price for that bow. Maybe $450 if it is truly "like new" and you really like it.