The defibrillator and the ammo pack have their beta looks, the ammo pack would be a backpack that could be in place of the healthkit and also the Defibrillator and the defibrillator has its beta look by finding the game files. This was redone in Left 4 Dead 2 with two having their models faithful to those of the beta
The model belongs to the K96-123, Undead099032