Handling time is usually one business day, but I'm a parent who has a day job so sometimes it'll take a day or two longer to pick & ship.
We use boxes to ship, not mailers.
We accept returns; the Buyer responsible for shipping for returns.
We're human, mistakes happen. If I mess something up, please take a picture (if possible) and send me a note of what happened. I'll do my best to make it right within reason.