Sounds like gold to many.
Some suggest selling it, but I think trading is a nice option. If you go to a
local farmer's market you might find someone with something of value that you want.
It might not be worth the time and hassle to sell it, but
Facebook marketplace is pretty vibrant (although often frustrating). Local to me is selling a 50 pound bag of aged manure for 5 dollars.
It also depends on how many bags that you have. I purchased finished manure for like 7 dollars for a 50 pound bag from retail. The benefit here is that it is a known seller with tracked reliability in the industry. You getting these second hand is even less credible. This isn't any critique about you, but merely a statement about how some growers are very selective with what they put into their garden.
Be prepared for questions and tire kickers if you list
online for sale. It is a big equation of "is it worth the time and stress". Only you can do that calculation.
My choice would be to use the manure. It might need to be aged before you add it to you land. If this manure comes from steer grazed on your land, that would be even more reason for you to use this yourself. The microbes will be specially adapted for your environment, and conditions there locally. You might think of using a few of the bags to give back some nutrients to the land, as some might suggest that all of the manure could have gone back into the land.
If steer grazed the grass, and all the manure is gathered, then the local ecosystem is losing out on a great deal of nutrients. These type of animals really turn grasses into fertilizer effectively. I doubt that it is a situation that would create deficiency, but it is simply something that I would think about when deciding what to do with the soil.
Again, I am assuming this was grazed from the property, meaning that the manure is a portion of the nutrients meant for the land. I don't know how efficient manure producers are, so I am kind of shooting in the dark here.