The old lady is the bomber's aunt. In
part 13 he remembered her:
He joined his voice with that of the crowd, allowing his enthusiasm to manifest itself in song. No one could object to him singing hymns. After all, thanks to his holier-than-thou Aunt Ina, he knew all the words, and even she had admitted he had a decent singing voice.
The thought of Aunt Ina threatened to spoil his ebullient mood. Perhaps it was time to take revenge on the old witch.
I'm sure the package is his revenge.
Looking forward for the next chapter, Jenni.
Andreia