I seem to recall hearing they weren't even getting those bonuses, so I had a little poke around on the internet.

It seems that the $50k sign on bonus only goes to retuning agents that were retired, and paid in $10k chunks, most of which went to taxes.

Despite the government's attempts to keep the exact details of the offer secret (for instance, U.S. Citizenship and Immigration Services, another DHS agency, placed an asterisk on the $50,000 bonus without seemingly clarifying what its terms are), reports suggest that only retired employees returning to the job are eligible for the bonus and that it comes in $10,000 chunks.

https://www.yahoo.com/news/articles/unpacking-rumor-ice-agents-arent-152800052.html?guccounter=1