Here is a video of the bottle cap matrix so you can see how it looks:
The reason why I chose to do it with plastic bottle caps is because they are easy to grip QUICKLY. I tried it with coins with tags/flaps of invisible sellotape (pointing up) in the middle of the coins but always go back to bottle caps.
I only found out recently of Bob kohler's version even do I came up with my version many years ago. In Kohler's trick he also uses one coin to impersonate others but he vanishes the coins one at a time. The handling for stealing and replacing is all different. The bottle cap version is much easier (in my opinion) and I think more deceptive because the speed of the routine almost generates a retention of image that each cap is under the card. Of course you don't have to use bottle caps - any object that is easy to grip such as dice, candy etc.
I am not aware of 'Caplocation'. If anyone can send me a scan I would like to see how similar or different it is.