Our back gate

Sometimes I wonder if people live on a different planet than I do.
We were expecting a delivery of two chairs for the dining room but knew we'd all be out when they came.
The boss had spoken to the driver and told him we would be out, but he could leave the boxes on the front porch.
I got home first and was surprised to see two huge boxes clearly marked "Fragile" inside the fence at the back. I looked to check that the back gate was locked, it was. 
WTF?
I looked at our security camera recording and watched 2 men try the handle on the gate several times, and then proceed to drop the two boxes over the top of the gate. There's a sign right by the gate handle, you can see it in the extra.
I unpacked the boxes and thankfully, there was no damage thanks to a wonderful crating job done at the factory. But what if had been pissing down like it did about an hour later?
I'm having a new sign made to say that anything left here will not be acknowledged and will be considered undelivered. A photo of the new sign will accompany any online orders that we make.

Ah well...