As others stated, the screws are in a tiny bag. I ordered two monitors.
One, they were tapped to the back of the base, so it was a bit more obvious.
The second, the box was taped weirdly, like it was re-packaged. Anyways, no screws in that one. My guess is someone returned it, after throwing away the screws, then the RMA dept for Samsung just repackaged it and resold it, (with no screws). I had to return the second monitor.
I made sure to tell them to make notes on the return so there won't be a 3rd sucker in this line.