An issue happened today that sparked this post. Me and my girlfriend run a small supply shop on Etsy. (Magpie Lane Supplies on Etsy) We do it to help offset the price when we buy in bulk. We ship to people everywhere in the world. Today someone opened a case saying that they had not received their item that they purchased in December. They reside in India.
Now we keep pretty good records, though I am not as organized as I should be. I generally make it a point to add shipping notification on every item I ship as well as the tracking number. I must have been out of customs forms and got one at the library because I marked the item as shipped but did not provide a tracking number. *Hint: You should always add a tracking number.
Fortunately, I keep receipts for any packages that I ship outside of the US, I always have. I was able to enter the number into the claim. I am not sure what is going to happen with this because there is no way to track an item sent out of the US First Class Mail. It may be I end up refunding the money. I do have proof that I shipped the item and proof that it was in the US for a time.
The point of the matter is you should keep detailed records of all kinds including records of shipping. I plan to put a tracking number into the Etsy system on every order from now on just to be safe. Keeping accurate records can save you money.