Replying to Please help me!!! Important!!

So I bought a crowbar strap from someone on here. I got a torn up evenlope in the mail the other day with no return address or even filled out correctly so the post office can't track to where the evenlope was destroyed or where it came from. The strap is nowhere to be found. I contacted the seller and he said that is what he shipped the strap in. Am I entitled to a refund? This isn't a callout just need help with this.