The 250 emblem vet reward is going to be replaced with something. It just hasn't been done yet. If you gain access to this perk between now, and the time that reward becomes available, you should receive the new reward automatically. Gozer actually addressed this when those changes went live.
No the 600 day VA token doesn't count, at best it was making a weak vet reward somewhat better and at worst it was a bad compromise to a decision that negatively impacted on player so Cryptic could have some more money.
So when will we get a replacement for the removed 500 day vet reward? Please Branflakes, add this to your list of feedback (and I mean that wholly sincerely, gotta watch my back since you can get infractions without breaking forum rules...) because I'm not entirely sure the person or persons responsible are aware of this, it was some time ago.