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No one is allowed to know the seed, but a good way of experimenting slime chunks is to make a layer below Y 40 and well, see if you get lucky I guess. There really is no other way.
Or make your island swamp biome, that's another way.
I still don't know what a slime chunk is, but they seem to always spawn on the bottom layer, anyway my friend has this and it works really well so maybe it'll help, idk