If these screws are already packaged by their supplier, and if these screws are most commonly sent as 1 unit, then this is the way to do it. It becomes way to cumbersome to order 1 unit x 1000, 5 units x 1000, 10 units x 1000. Now when you run out of 1 unit orders you'll have to order more 1 unit orders because if you open a 5 unit order the cost to get that 5 unit converted to 5 x 1 unit in the system is to much. Then you have to worry about re-packaging 5 more units into 1 unit, packaging that you don't have nor personnel to do it.
Ya, it looks stupid, but it's still the most cost effective way of doing it. They are not going to get a huge bin of these unpackaged, then have someone count and package. Overhead would be added not only for someone to count, but now it's Dell's responsibility to find the packaging, design how they will be packaged, make sure the correct # get into a package, etc.
The packaging is a big large for the screws, however, if 1 part is ordered, it ships directly in that packaging. It is probably the smallest packaging they can use.
As well, the sheets are not full because room must be left for notes or any other specific details that could take up that space. Eg. specific details on a certain shipment or notes from the receiver about an incorrect order that is photocopied and given back to the driver. This form would be universal as well.