"FlyerTalk has a dedicated thread on FedEx corporate hotel rates. One commenter noted having "permission from FedEx's head of security" but the documentation was never actually produced at check-in. HotelCorporateCodes.com rates Marriott FED as "Sometimes." A key concern: FedEx reportedly monitors hotel usage volume with Marriott, and inflated usage could affect their contract negotiations. One user warned that using the code risks getting charged the full rack rate at full-service Marriott properties."

"I have been asked to show some proof couple of times. I normally show my corp id but credit card with employers name on it has worked, too. As would probably just showing my laptop with employer e-mail account or whatever. My impression has been they are happy with just about anything that proves I'm working for the company whose rate I use and why wouldn't they."

"I have stayed 100s of times with various corporate rates (including Japan) and the only hotel that has asked is W hotels. Even then they didn’t push much. I have been a consultant for 20 years and many clients require you to use their rates when they are paying the bill. The hotel doesn’t have an up to date list of every employee that works for a company globally. The woman at the W said “I don’t really care, just show me anything on your phone that says your name and that company. You can type an email now “."