Hi Niki,
For that, you need the sizes of each individual shuffel sizes.  For example if the shuffel[1] size is M. You can extract shuffel[1] as follows.
shuffel_1 = labels_total[N:N+M]

You have to use the proper indices to slice them correctly.
FYI, you did not delete the shuffel arrays/lists. They are still in memory. Hence, you can just use it.
Thanks