The mechanics for the small ammo packets thrown by Supports has changed. They now instantly provide you with two magazines per packet that you touch, then on a quick timer provide you one magazine at a time. To put this in perspective, if you walk up to two ammo packets while you have no reserve ammo, you will instantly have your entire reserve refilled. Ammo packets also recover explosives (sans grenades) faster than the ammo box. The only downside is once a single packet has restored 3 rockets or your entire reserve ammo pool (on its own), it will disappear.

TL:DR - Ammo Packets now resupply insanely fast compared to the ammo box.