Call or email the person who made you the written offer. Say that you're following up and want to make sure they received your reply accepting the position.Got the call from the LA personal Department and the lady told me I will receive the offer letter in 2 days and paperwork to fill-up. This prevents applicants from having to seek other employment while they wait for a response from the potential employer. Applications are only accepted on-line and paper applications are no longer accepted. To create an applicant account, go to Career Pages website and click on the Sign In tab, and then Don't have an account? If you don't receive a reply, you could also consider calling their office or contacting someone else in the HR department. The answer to your question, regarding whether you can back out of the Offer Letter, is likely "Yes. They are acknowledging that they received your application. Probably a form letter with an auto-signature, likely what everyone who applied got.