Spot checks on more than 400 households across Birmingham by police and council officials have failed to uncover any evidence of planned postal vote fraud in today's General Election.
Inspections were carried out on a small sample of the 59,000 people who have applied for a postal vote.
Auditors from the city council, accompanied by police officers, visited properties where applications could have been regarded as suspicious.
These included addresses where more than six postal votes were to be sent to a single house, applicants who were asking for postal votes to be sent to properties where they did not live and streets where most of the residents had applied for a postal vote.
A council spokeswoman said: "These visits are still going on but we have not yet found anything untoward."
The visits are part of a package of measures by the council and police to prevent mis-use of postal votes following allegations of widespread corruption at the 2004 local government elections. The council has also written to all people on the postal vote register in an attempt to weed out false claims.
Detective Inspector Dave Churchill, of the West Midlands Police economic crime unit, said: "We have been checking addresses where things wouldn't appear to be the norm, but we have found no criminal activity."
Two men from Stourbridge who attempted to sell postal votes on ebay were given a formal police caution.
John Hemming, deputy leader of Birmingham City Council, urged people who applied for a postal vote but failed to receive a ballot paper to go to a polling station where they could register on a list of missed voters.
Coun Hemming (Lib Dem South Yardley) said: "They won't be able to vote but it is very important that we make a list of all those people who did not get the postal vote they were entitled to.
"Postal votes were sent out later than they should have been and I am very worried that this will cause problems. But we won't know the extent of this until after polling day."