Help with gated brand – out of biz

I purchased a large inventory of clothing of a brand that filed chapter 11 bankruptcy a few years ago (from a liquidation company not the brand). They have an online store still but while it works, they haven’t put out new product in years. I’ve tried to contact and no response.

The brand is gated on Amazon. It was being sold on Amazon when I first checked but it is no longer on there.

How can I move forward?