The Mystery of the Disappearing Milk Bottles

We've been having our milk delivered for 5 or 6 years now, ever since we moved into our current property.  I really enjoy the convenience of having it delivered even though it is a little more expensive, as I can tailor delivery to our weekly usage and as a result we vary rarely run out of milk.  Until recently that is.

In recent months, incidents of disappearing milk bottles (full ones) have escalated from outside our property and sadly I've come to the conclusion that it is no longer viable to have it delivered, due to the dishonesty of certain person(s) who feel(s) that we are fair game to steal from on a regular basis.

There is only so long you can keep turning a blind eyeand when two full bottles disappeared last Friday followed by another full bottle today, I have finally decided to cancel my order.  Unfortunately, due to our front garden being reconfigured due to having a basement extension and light well built, it is a lot more difficult to hide the bottles behind a plant pot so the only option left is cancelling my order.

It may be a very desperate person who is stealing our milk, but taking half of the milk we have delivered in a week is just a bit too much of a liberty to be honest.  It almost feels very personal.  Call me uncharitable, but I really can't go on subsidising someone else's grocery bill unwillingly.  It is a completely different matter should I choose to donate to a needy cause. 

I've thought about setting up a camera just out of curiosity, to see who it is, or staking out one morning after the milk is delivered at 5.30am, but to be honest I really don't know if it is worth it and I might get a nasty surprise if it turns out to be someone we know, so I'm just going to remove the supply and the obvious temptation for them.  Sad and disappointing though it is, as I've had a good service all these years, maybe it is time for a change.  What would you do in this situation?