If your package hasnt scanned in a few days, we recommend first contacting USPS for assistance. If no additional information can be provided, you may open a case with Etsy. To begin the case process, send us a message on Etsy if you haven't already. There is a 48 hour wait period between the first message you send us on Etsy and when you can submit a claim. After 48 hours, head back to your "purchases" tab, select the order you placed with us, and here will appear a button to submit your claim.
More info on the case process:
https://help.etsy.com/hc/en-us/articles/5745586898199-How-to-Open-a-Case-?segment=shopping