Might be real. They discuss return labels here, and elsewhere:
https://www.paypal.com/selfhelp/help/article/FAQ1681/2

Always good to check if a PayPal related thing is real by forwarding the email to:
"Think you’ve received a fake email from PayPal? Forward it to spoof@paypal.com and we’ll let you know if it’s authentic."

Robert
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Kay Francis (center) at baccarat table in an illegal gambling den "The House on 56th Street" (1933).
http://www.antiquegamblingchips.com/StillsC_FemaleStars.htm