PHP Code:
new ent = FindEntityByClassname(-1, "tf_mann_vs_machine_stats");
if( IsValidEntity(ent) )
{
new offs = FindSendPropInfo("CMannVsMachineStats", "nCreditsDropped");
PrintToServer("%d", offs);
}
This returned 12, so it seems likely that 0 is indeed the right offset location, however you should be searching for tf_mann_vs_machine_stats when finding the actual entity.