Personally I think you should throw it at least a few times, you never know what would work for you, If you don't like it, then trade it for something, better yet you can give it to an EDGE program or a school disc golf club. NEVER JUST LEAVE A DISC, you may be keeping someone else from enjoying this game we love so much. Unlike some people on this site that have tons of money to spend on plastic most of us have to scrimp and save for every piece. But of course some peeps just don't get it.
You'd probably be better off leaving it where you found it.
I agree with Jack. Give it a shot and if you don't like it trade or give it to someone that needs it or like you said return it. I know when I loose a disc its going to be a LOOOONNNNGGG time before I can replace it.
No problem, just one more great resource site for disc golf. It can really help you get an idea for about any disc ever made. Now I'm sure there are some that would say the site isn't perfect, but it will help you a lot more than it will hurt you I think.
I just have to say wow, what a great site! Thanks Mike.