HI again @Zotacat ,
OK, got the picture now In fact what's happening in video Number 3 is that Vince is demonstrating how to create a drum rack with your own imported samples. The goal is to build a drum rack with up to 128 ( that's the maximum number of samples allowed within Live ) select-able samples. It's one technique that some people use in order to make handy custom racks that allow them to browse quickly between samples until they find one suitable for the current mix.
So in the end, it's obvious that all those samples are not included in the course resources since they belong to the tutor and once again, the closed & open hats used in the track are available for you in the resources samples as mentioned before.
Hope that helps & clarify a bit this process