The receipt has been signed. Sorry, we can not put a word "COLLECTOR" under the signature, because this is a computer issued receipt from the accounting system, if I changed it for you, the receipts in future will be the same format, which is not the standard format in Hong Kong. If you would like "COLLECTOR" there, I just can put it there by hand writing. Let me know please if you need it. I will post you out the original. Thanks.