HI: Ive never had the pleasure of a 21 day hold,,, BUT--
Ive had my acct frozen many of times, sometimes it takes almost a month to unfreeze..
My suggestion:
Ship the item--apparently-paypal has the money on hold..
Then, input the fastest tracking u can handle, then followup-with an email to pp the very same day the goods are signed for..
Sorry-thats the best that I know to do 
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