If you sent the package by Registered Mail, it may be that the buyer has not been notified by their post office that the package is there waiting for a signature to release it. I know this because it happen once to me.
I would suggest you send a printout of the USPS (not Sweden Post) tracking information to the buyer and ask them to take it to their local post office for investigation. If the package is in the post office and it is not picked up within 30 days, it will be sent back to you.
Hope this helps,
gatorcpa
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