Wait I'm confused what does the end of the horror story he told mean

same, i didn't understand how the bag made him the boss.

Its how the quality of the bag is, if its well taken care of the quality of the owner also becomes good like the bag was in good condition because the guy took such great care in it so he also did well in his workplace enough to become a boss

As u can see at the end the guy was still polishing and taking good care of the bag lol