If a letter was returned because of an invalid address, the child's new address was searched for via telephone directories or registration offices.
Another of the addresses being searched was an £800,000 property in Dartford, Kent.
"A further address on Highgate Street, Liverpool, is also being searched, bringing the total number of addresses being searched to ten".
More than a million addresses were searched in the site's first month.
Addresses were searched in Westminster, Hounslow, Hillingdon, Brent and Richmond, and in Slough where property was seized.
Twenty one men and one woman were arrested in dawn raids as 41 addresses were searched across the capital.
Two addresses are searched - Wilton Close, Southmead, five miles across the city from Becky's home and Cotton Mill Lane, Barton Hill, two miles away.
Homes and other addresses were being searched in the Aube region, in Essonne, south of Paris, where Mostefai was born in the town of Courcouronnes, and Eure-et-Loire, where he had attended a mosque in Lucé, close to Chartres.
Six residential addresses are being searched: three in south London, one in east London, one in north London and one in Lincoln.
The agent refers by address to the spoon being searched for ("Reference by address (coreference)").
