"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 get asked every single time on Government Rates/Per Diem Rates. (Multiple properties per month) I just know to keep my ID right there. Every once in a while they will try to photo copy it and then have to explain that isn’t allowed, otherwise I have no issues with it being validated."

"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."