well if i plug 15b5 into my calculator as the image in that thread says to use, then it converts to 5557 as it says.
so if i do the reverse for 2870, i get 0B 36, which in reverse order is 36 0B
46 1C reversed and converted is 7238
Please ignore my last post, I mis-remembered how the SKC calc is done.
Just had a look at this file and it looks like a cluster bin, but I cannot figure out where the SKC came from.