Trade BON4M for BON4M Small

I purchased a BON4M from FetishToyBox a few days ago.

Once I found the right ring size, it turned out I was being a bit too ambitious with my little guy and the cage is simply too big.

I've worn it for about an hour. Would like to simply trade it for a BON4M Small - can do the whole package, or ideally, just trade the cages to make everything easier.