That's just two examples, but needless to say every type of item has a unique mapkey. The strings convert into bits of decimal, as they look to be Hex, but there isn't a pattern that I know of, so I'm not sure where the game is creating/originating these numbers from. I've tried changing the mapkey to be a new random number, same length, just off a few numbers, but that doesn't work either.
Do _not_ steal or reuse MapKey-s! They are UUID-s (
https://en.wikipedia.org/wiki/Universally_unique_identifier), and each one is complete unique, as the name implies. AFAIK none of the bits mean anything, so you can use any v4 UUID generator (like this one:
https://www.uuidgenerator.net/) to generate your ID-s. Also make sure that you use unique names for the objects, as the game checks those at a few places as well.
