"Costco's Hyatt code (66267) is a Costco member discount, not a Costco employee code. FlyerTalk discussion: "Costco Travel arranges negotiated rates for Costco members — this is a published membership rate, not a confidential corporate employee benefit." Costco members must show membership card at check-in, not an employee badge. The verification risk is minimal: Costco membership is easy to obtain and the card is easy to carry."

"Could be working in financial institutions, where they typically require employees to take mandatory leave (2 weeks-ish) and they don't have access to any corporate systems due to compliance"

"I use my corporate rate all the time and was never asked for proof until my last stay. My work ID doesn’t identity the company since it provides building access so they accepted me sending an email from my @company.com domain on the spot"