I found several beetle type bugs in a bale of alfalfa I recently bought. They are 2cm long, some are a little smaller. Are these blister beetles?

I dont think so.  

Blister beetles have a very narrow thorax, no matter what type (striped, black, etc). That doesn’t look like one. You can probably ask your county agent to make sure 

Here is a few pictures of Blister beetles, theres so many different types.

I'm going to say no. But also, that being said, I myself probably wouldn't feed it because im weird that way. Where did this alfalfa come from, if you know ..?