Silver gem studded buckle size 39 Birki's Birkenstocks

I bought these off FB marketplace without double checking my size. I bought these pre-owned and have not worn them as they are too big. The woman I bought them from said she had the cork serviced every year - didn't even know you could do that. These have standard wear and tear. I feel as though the sole look as though they have more use than they do in the pictures. All the stones/gems are present in all the buckles. Feel free to ask any questions you like. Looking to recover what I paid.