You don't see the skulls in your inventory when you pick them up. There are 5 to find and you drop them off at 5 locations to get a blueprint for a developer's mod weapon.
www.gamefront.com/dead-island-skull-locations/
www.thehdroom.com/news/Dead-Island-Skulls-Locations-and-Drop-Off-Guide/9501
Ah... thanks for the links m8tal. That clears things up a bit.
Now if I could figure out how to, or if it is possible, to modify more than one store at a time so I can shop for my weapons without having to quit all the time, or put back in a "stock" shops.scr file except for the place I am about to visit. That would be good!
When I tried it before I got nothing... and by nothing I mean that the shops were empty. Perhaps I missed something. I can do it if I only modify ONE shop (I did the one at the church) and got some good stuff. But I want to be able to modify at least a couple of them throughout the game and just keep the file intact from then on. Is that possible?
Ok... you CAN mod more than one shop at a time in the game. This last time I did it step by step each time I went to a new area (different act) and it worked. Though, looking over the code from the first time I tried doing it all at once I think I may have put something out of order or used more than 4 items in the shop. Plus, this time I only modded one shop per area which is all I needed anyway. At least I could go back to all the shops and still buy stuff if I wanted to when I did it this last time. You know... when you would go back to an area to finish a quest or something.
So thanks for all the hints and tricks you guys and gals... I have about 212 hours in now and it's still fun to play!