Mailbox theft is now rampant all over Sydney CBD and outer suburbs. Consequently, Identity Theft in the form of Credit Cards and official letters make this a good way for thieves to take advantage and cause you alot of headaches. This can be averted with a high security mailbox lock. I recommend the rotary type gem lock as in the picture. The reasons are this type of lock has no where to stick a screwdriver and force it, and the other advantage is this type of lock has a thicker tailpiece so if the lid is forced these tails usually do not bend at all. Call Paul - Locksmith Sydney for a quote to supply and install one for you.