Rebecca waits a few days to a week for payments to clear, or to make sure your payment is not fraudulent. I believe she does that for ALL buyers.
If you read her auctions, you should see:
"Due to a significant increase in the number of PAYPAL chargebacks through receipt of 'fraudulent' funds, I will now no longer post items immediately for overseas bidders. Items will be held to allow PAYPAL to advise if I am in receipt of fraudulent funds. "
After she confirmed that my package was sent, I received it within a week.