Pulling a fast one

Couriers never cease to be a pain in the backside. This week I had a next-day delivery fail to show up, and when I asked the supplier to make enquiries the following day, they were told that the courier had attempted to deliver at 18.10, but found that the school office was shut, and left a card.

Which might be a reasonable excuse, except that:

There was no card.
Most business, let alone schools, are closed by 18.10.
There is a sign on the door saying what to do when the office is shut for deliveries.
The sign says to push the doorbell, which during the holidays we have rigged up to ring the school bell system. I was actually in my office at 18.10, and the bells didn’t ring.
The CCTV recordings show that at 18.06, the distinctively-marked courier van can clearly be seen driving past the entrance to the site at 30mph without even slowing down.
In short, courier drivers are lying turds.