"I've found that the non-US properties (granted I havent stayed at too many) ALWAYS ask for proof. But at US ones, i'm never asked."

"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"

"AAA (alt) Hyatt codes (17500 and 15985) are secondary AAA membership discount codes. AAA rates are publicly advertised membership discounts — not confidential employee benefits. FlyerTalk's dedicated 'AAA card – Do hotels check?' thread documents: 'One frequent traveler staying 1-3 hotels per week was asked for the AAA card at about 10-15% of hotels.' AAA membership cards are easy to carry and present. These alt codes share the same low-risk profile as the primary AAA Hyatt codes."