Complete Post-Arrival Check In e-form. 3. Here you find extremely professional offer acceptance letter samples.Offer Letter (Recommended) – After a job offer has been made and accepted, an offer letter may be completed and given to the new hire. If you have made up your mind then write a simple letter telling them that you have decided to withdraw your acceptance letter. Ask your HR for a signed copy of the offer letter package which will show title, location, pay and type (salaried, hours and if hours what guaranteed hours are) How Much Does an Offer Letter Cost? The average cost (i.e. Learn to write an effective offer letter acceptance mail with this comprehensive guide.