"BlackRock's six-digit numeric code (340965) is notably less circulated in public forums than three-letter ticker codes, slightly reducing discovery risk. However, finance-sector codes in NYC and SF see elevated scrutiny. "Medium-risk codes are subject to spot checks, especially during mid-week peak business travel, with properties in major metropolitan areas being the most likely to ask for a badge." BlackRock's NYC concentration and premium rate level keep this firmly at Medium. Numeric codes also trigger less "code sharing" behavior, reducing overall exposure volume."

"I think the generic 'show corp id' designation means show the company business card. I think a lot of us don't have them or, if we do & we're not going to an office that we'd need to show them, leave them at home. I worked for some F500s that didn't require corp ids with shiny smiling faces on them & others that did; same with company credit cards. All, however, provided biz cards when working for them."

"I occasionally try to get the corporate rate for a company I'm visiting in the area (for sales/consulting). Only once has a front desk clerk asked me to prove my eligibility, and she was satisfied by me giving the name and telephone number of the person I was visiting."