Gothamintercontinentalhotel.com

The site

Gothamintercontinentalhotel.com is the website for the Gotham Intercontinental Hotel.

Operation Slipknot

For Operation_Slipknot, the participant calls the concierge number (1866 306 5589) and uses a reference number to convince the concierge to send them a package.

(Gothamintercontinentalhotel.com) -- direct link

This number appears to be accessible from the United States only.