Alpro A630 - Black Alpro-foam

The product has been used, and how do I know that? the sole of the inside of the shoes is dirty. Has food marks on it. I ordered directly last week on Birkenstock and the insole was super clean and very white. This was from when I opened the box it was like it has been used for 4 days mostly. I was very disappointed. But i cannot return it because I need to use it. Just very disappointed that you give out USED OUTSOLES. thank you