Basically ,I suggest you complaint to Yahoo and call police.
Everyone reg from yahoo auction have to leave down a mobile no. for confirmation,so Yahoo at least can provide this no. to police.
Thanks
你之前有無同呢個買家買過嘢家,如果有,你有無佢d電話地址record,另外你可以睇佢之前d買家有無電郵留低,你send d message問吓嗰d買家有無留低個seller d資料,另外,你可以問一問yahoo嗰邊可以點做,記得留低張入數紙同有關電郵,你最好print埋出嚟先啦,同埋你可唔可以post佢出嚟,睇吓我地有無人同佢交易過啦,唔好咁唔開心,唯有下次小心d啦