Mr Daken, however, said he might keep the stamp.
The latest scam follows a phone scam that involved scammers abusing people called.
In July Waipukurau's Michaela Lawrie was one of several Hawke's Bay residents whose landline was plagued by scam callers asking to speak to her up to 12 times a week for the past year.
Ms Lawrie said the calls started happening a year ago when she got a new phone number with TelstraClear.
The callers, who claimed to be from Microsoft, were constantly asking to discuss a payment made to them.
She had received the calls from males and females and felt the callers were trying to wear her down.
"The males can get quite irate."
Ms Lawrie said she had checked Microsoft's website, which said the company did not make unsolicited phone calls to its customers.
Mr Daken's letter had him smiling.
It reads, "Firstly I must solicit your confidence in this transaction, this is by virtue of its nature as being utterly confidential and top secret - though I know that a transaction of this magnitude will make any one apprehensive and worried, but I am assuring you that all will be well at the end of the day."
The letter goes on to point out that an "expatriate engineer" with the surname Daken had died and unless someone with that surname stepped forward and was "presented to the bank" as a relative the money would all end up with the Spanish Government.
The legal firm was prepared to attest that Mr Daken was a relative and if he agreed to go along with it he would receive a 40 per cent share of the money.
"The intended transaction will be processed under legitimacy, which will protect me and you from any violation of law," the "lawyer" wrote.
"Where there's one there will be others," Mr Daken said.
One thing that did attract his attention apart from it being stamped, was that the way his name was used - with the surname first, suggesting it had been taken from a mailing list.
"They've come across a list somewhere."
The approach was well known to the authorities.
A check through the internet shows there is a legal firm in Spain called Luis Romero y Asociados and they have been involved in several high-profile legal cases.
However, further checks also show the firm, like many others in Spain and Portugal, have had their letterheads and titles lifted by scammers in pursuit of easy money.
"People need to be well advised that there are many scammers trying to pass themselves off as legitimate Spanish law firms and lawyers," one scam site spokesman said.
"They prey exclusively on foreigners and are, in fact, not Spanish themselves - they are mostly Nigerians in Spain."
