如何用簡單句子在formal letter 中表達「已收到你的文件及多謝」?

I'd received your document and so much appreciated your co-operation.

Thank you.

B. regards.

Yr Name

i have already recieved your document and your token of thanks

2007-05-26 17:25:07 補充：
that one is wrong!!!it should be i have already recieved your documentthank you

We have received your document.

Thank you.

OR you may consider this:

Your document has been received.

Thank you.

I to receive your files already,thank you.