Option 1

Talk to your friend directly, express your disappointment and concern, and strongly advise them to return the money and confess to management themselves, offering to support them through the process.

Option 2

Immediately report your friend's theft to your manager or HR department, providing all the details they shared with you, even if it means losing their friendship.

Option 3

Keep your friend's secret and do nothing, hoping they will stop stealing, and avoid discussing the issue with them or anyone else at work.