What they need to do is to set up a bunch of freezers at the Pentagon, then have a fixed contract with various pizza delivery places to deliver N pizzas every day. If they actually want the pizzas, they eat them. If they don't, they stick 'em in the freezer and donate them M days later

whatever degree of delay they require against traffic analysis on their pizza deliveries

to a food kitchen or something.

There are still other information-leaking indicators, though:

• Lights in windows, for offices with them.

• How full parking lots are after hours. During Operation RYAN, Soviet intelligence used this as an input.

  https://www.wilsoncenter.org/publication/forecasting-nuclear-war

  The bulk of newly available Stasi and KGB documentation on RYAN from the BStU Archives in Berlin does not address Able Archer 83. However, it casts an unprecedented light on Stasi and KGB perspectives since 1984, as well as on the operational details, structure, and scope of the RYAN project. The collection includes a KGB catalogue from 1984/85 that, in excruciating detail, outlines the 292 indicators that might precede a potential “surprise nuclear missile attack.” Many of them refer to activities in and around Washington offices and buildings, including the White House parking lot. The collection also includes summaries of monthly KGB reports up to April 1989, which list possible global indicators of preparations for a “surprise nuclear missile attack.” These records tell us that hundreds of KGB officers were assigned to work on the RYAN program and a special division was created inside the KGB exclusively for this purpose.