If the buyer provided a phone number it would be listed with the sale information. In most cases they do not (providing phone # is optional).
The only way to get the information is to try to contact the buyer and explain that the phone number is needed for the international shipment.

Try going through the buyers paypal email (check your invoices in paypal) if they will not answer through Bonanza

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That might work for FedEx as well.

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