When you make contributions to your 401(k), the funds that you put into your account are vested immediately and are yours to keep, even if you leave your job the next day. While companies can have different rules for when you get to keep employer contributions, all money you put into the account is 100% your own. But what happens if you make a contribution and see some of the money disappearing days after? Is this a sign of fraud or something that you should be worried about? Let's take a look at a hypo ...