How Do You Express Gratitude and Still Find out Where to Return a Crummy Gift?

I'm getting married soon and wedding gifts have started arriving. I honestly appreciate that people are thoughtful enough to have sent gifts but someone sent me wine glasses. I quit drinking five years ago! Now I don't know where to return the glasses. What do I do?

Suggestion:

"Why, thank you! Oh, these glasses are lovely! Where exactly did you buy them? I like them so much, I want to buy my friends/coworkers/distant relatives some sets of these glasses!"

Problem solved.