Please use delivery confirmation when mailing out goods that are rare/have value to the buyer or seller, it provides assurance for both parties that the product was shipped and/or the product was received. It is hard to replace items that are not easy to come by, and USPS is notorious for losing packages. Even if the failure rate is .01%, that means in 1000 packages at least 1 is lost. Delivery confirmation is only .80 cents to 2 USD, and is even free when you ship online. I've lost a couple packages, but luckily the seller was willing to replace the goods given their lower value; but that is not always the case. Packaging the product well is always a plus, plastic bag and envelope is never enough for a single keycap. That is all.