Ok what I would do then is go back in find a sales associate tell them that you are interested in buying thisorthat OS and that you want them to tell you what the EULA so you can decide whether you agree with it or not before you get home and open the package and make it unrefundable.
This might not get your money back but the sheer pleasure of going from several different sales associates and managers having them trying to explain that policy would for me more than make up for the money.
Me:"Hi I have a question about one of these Operating Systems"
SA:"Sure what can I help you with"
Me:"Well I need you to tell me what the EULA says so I can decide on whether or not I agree to the terms"
*silence*
SA:"Well lets see"
*looks over box*
SA:"I dont know what is it?"
Me:"End users license agreement I believe."
SA"I dont know its not on the box...so it doesnt show it."
Me:"I know thats why I asked...I cant read it"
SA:"You'll just have to get it home and read it I guess."
Me:"Oh so if a get home and read it and dont agree with it...I can return it for a refund?"
SA:"No but you can exchange it for the same title"
*silence*
Me:"Why would I want the same title if I dont agree to the license agreement?"
*SA fidgets*
SA:"Look I have no idea the EULA isnt on the box you'll just have to buy it to see it"
Me:"Please get me a sales associate who can answer my question"
SA:"LOOK NO ONE IS GOING TO KNOW THAT."
Me:"Get me a manager now."
...lol then go through the same process with the store manager and when he says "Look you dont have to buy the product if you dont want it!" then say "I dont know whether or not I want it I need to read the EULA first before I make a decision." and if he doesnt give you the answer you want tell him to give you the phone numbers of both the district and regional managers as well as any phone numbers where compliants can be given.
Now this might not get anything done but for FREE you can give them the same headache they gave you.
And you never know they may slip up and say "Well if you dont agree you can bring it back for a refund ok"
to which you would say...
"Funny you should mention that I just so happen to have purchased one already that I didnt agree to."
*silence*