Assing atom ID after performing the simulation

Dear LAMMPS developers and users

I have performed over 400 simulations using LAMMPS (that took almost 6 month), and now while post-processing my results, I have faced the need for atomic IDs.
For an exact processing, I need atomic IDs in every time step (e.g. one simulation contains 60000 time steps and I have stored atom type, x, y and z positions of each atom in each time step). Is it possible to add atom IDs for the performed simulations? or do I have to repeat these time-consuming simulations once again?