Hi Em,
Thank you so much for leaving a review with us!
We do not recommend storing your pieces in their original box, as they are only designed to protect items for safe transportation. This is something that we advise on our receipts and tax invoices, and on our online product care guide which can be viewed here: https://www.francesca.com.au/pages/product-care-and-warranty.
We find that a simple polish with a clean microfibre or jewellery polishing cloth works to fix this.
If you are concerned about the tarnish of your piece, please don't hesitate to reach out to us at hello@francesca.com.au and our team will happily assist you! xx