Rec'd this email just now:
"This email is to inform you that we accidently paid you twice this afternoon.
Please log in your Paypal account, find one of the payments from __________ on 1/9/17, just click the detail of the payment and choose refund to process.
If you have any questions, please feel free to contact us. I apologize for the inconvenience. Thank you in advance."
Obviously their mistake - why should I refund the $$?
@JASFLALMT didn't make it up, it was one of the Sassie MSCs. I can't have been the only one to receive this message.
FYI, there was no fee to refund the $$, and it was done almost immediately.