"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 now always make it a matter of course to carry documents (business cards of my contacts, e-mails requesting my visit etc.) from my host company when I travel. This has always proven sufficient for the few times I've been challenged by the front desk clerk."

"I work front desk and it seems like management is really pushing to check IDs for any special rate. Personally im lazy and also don’t care that much to start a confrontation so I only verify govt rates and employee rates, but yes it is being enforced more harshly. Corporate rates I guess are easy to find online and thus abused. Again, I don’t care that much because they’re still pricey anyway !!"