I have the tracking info. USPS stopped scanning after it left the origin post office. Tracking numbers mean nothing at that point.
I did not have any options on shipping mostly because the seller included shipping and I figured it would be reliable
Was the seller an individual? Maybe you can show them the tracking and come to an agreement. Maybe, they can go to the original post and investigate a little bit. I realize the package probably has no insurance, but there has to be some recourse if they just stopped tracking. One would think it should be close to the last recorded track. The blame clearly is on the post. I would call around and ask nicely until I get someone willing to help find it.