Thursday 20 April 2017 12.56pm
This is an ongoing issue across the borough. The police are aware but say that it falls within the remit of the Fraud team, not specifically their own.
There is a gang and possibly gangs that target mailboxes across SE1 and London. They can pick mailbox locks and often steal mail out of the flap, esp. when mailboxes aren't emptied regularly.
Change your lock to a more secure one (speak to a locksmith) and possibly investigate replacement box flaps that don't allow mail to be picked.
The police advise always reporting every crime via http://www.actionfraud.police.uk/report_fraud