Look at the tag it will give you all the mix percentages. I'm sure it's fresh seed, most SS products are quality. If it is mostly oats you could buy feed oats and create your own add ins
We planted a couple of plots with it last year. Deer mowed it to the ground this winter during that month long cold snap. Put a couple of loads of litter on it when we cleaned out chicken houses this spring. It was over 5 ft tall by the end of Turkey season. Mowed it down and the plot has survived all summer. Not sure what it was in the mix that survived and had been growing though. Some kind of leafy greens. Arrowhead clover is dormant though for now. Deer and turkeys are still hammering it daily/nightly.
Probably going to overseed it with the same mix or a clover mix, spike it in and then mow it this fall to see what it does.
Planted some of the SS eco-till radishes SS purple tops and kale on Friday afternoon got rain during night most germinated on Saturday. Good luck this fall