Some agencies do require reporting this sort of thing, any kind of large cash deposit. I cashed out a bunch of vacation hours when I left my last job (actually the last two jobs) and I had to report that. There may even be an online tool on the government network (if you have access to it). Better to report something like this now than have to explain it later. If your security officer says you don’t need to report, make a note of the date and who told you that… better yet keep the email 
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