Item sitting at post office, can I ask for its return?

I purchased an item from a vendor. Essentially, I was ripped off and decided to return the item under their "no hle 30 day guarantee". I notified them of the return, and obtained a return authorization. I sent the item back as instructed, and now the post office has attempted to deliver it, and they have not picked it up from the post office. It has been 7 days. I'd like the item returned to me before I file a dispute with my credit card company as I stupidly did not keep enough information to doent the fraud aspect of my allegations due to their "no hle 30 day return policy". Obviously, they have no intention of picking up the item and just giving me a refund. Thank you.