Administrative side: Admin log when null crates are ordered, and when a supply console is emagged.
Gameplay wise: null crates are cheaper, but you only get 1 or 2 over time, like you start off with 4 and gain 1 every 20 minutes, 5 minutes after a null crate order lands, an announcement plays about “Strange signals from cargo console”
Signalling the crew that traitors are afoot.
This also plays to the emag’s weakness, extremely obvious when emagged.
Let me know what you guys think