Case $1$ about the internal auditing work Gus Jackson and Jane Ramon

Respond with your thoughts about case $1$ p$\mathrm{.}23,$

$(1)$ What clues caused Jane to suspect fraud was likely to involve $?$

$(2)$ Is it important for CFEs or auditors to follow up any inconsistencies, even tiny and small?

$(3)$ In this case $1,$ What are Gus and Jane attempt to be looking for in employee's personnel files? Did it work as expected?

$(4)$ Anything else you might do if you were assigned to involve the internal auditing work $?$