These are my pencil cases in the lost and found case

问题描述:

These are my pencil cases in the lost and found case
虾米意思?
是一个提问题,请帮改出来还有are my打错了应该是are BOb's,叫你对划线部分提问,划线部分是BOb's pencil cases

whose are the pencil cases in the lost and found case