https://www.miamiherald.com/news/local/immigration/article312042943.html
Around 800 detainees showed no record on ICE’s online database. More than 450 listed no location and only instructed the user to “Call ICE for details” — a vague notation that attorneys said could mean that a detainee is still being processed, in the middle of a transfer between two sites or about to be deported.
Edit: derp, it’s fucking ICE that has no records, so my idea makes no sense. Who knows with that fucking circus.
I can think of a third possible option: some are hiding or have fled the country. If I was illegally detained, put into a concentration camp, then released, I’d fucking disappear posthaste.
Not sure of the likelihood, but one can hope.