HTTRJustin

So I’ve sold like 20+ items in my depopping career and all of it has been first class ship with depop. I just realized rn I been using the free Priority Mail envelope from the post office for all those packages I shipped. I was reading thru the subreddit and I saw that if this happens the package will get sent to me or the buyer has to pay the difference before they can receive it, but so far all of my packages have successfully delivered with no problem. What’s the deal