You can view all offers you've sent by going to your JOBS Sent tab. This is a great resource for viewing the status of the Sent offers.
Option One:
Navigate to the JOBS menu then select Sent
If the crew member has accepted the offer this image will appear to the right of the position date/time.
Option Two:
Click on the REPORTS menu then select the Job Offer Activities by Crew or Job Offer History (please note you will need the Job ID number for the audit)