我给老外写信 英语高手看看行不

我给老外写信 英语高手看看行不
一个外国公司给我邮寄了封信,但我没有接收到好象丢失了,所以我想让他再邮寄一次,以前的地址是正确的,过去我给他们邮寄过6个单独的写了自己地址小字条.
Dear Sir or Madam
I fail to receive your mail with the additional documents on the 05January2009.Please send it again.The address must be right.The address is on the six self-addressed mailing labels .Think you.
Yours sincerely
请看有什么错误没.大家看看行不

你看这样写会不会更好
I haven't received your mail till now,perhaps it was lost I think. Could you please send me again under the address I prepared for you before.
Thanks and best regards,

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