No official statements. What would a Iranian drone do in 5 or 50km border region? Spy on Pakistani strategic assets?
Turn on google map, you can trust your own eyes; Pakistani and Iranian Balochestan is a very underdeveloped rural region. Nothing there for Iran to spy on and neither for Pakistan within 50km of Iranian Balochestan.
We have many over nationalistic people writing here... just check via your own eyes how both Balochestans look like and which of the two country has almost no border structures and which has.
Well possible that Pakistan was informed about Iranian UAV border patrols and tracking of groups inside Pakistani airspace, a silent understanding. It would be in Pakistani interest if Iran would share surveillance videos about armed illegal militants.
Lets say the timing looks like a Saudi demonstration that US forces in Syria and Pakistani forces can down each one Iranian drone on the same day via the influence and power the Saudis have.
But there is no question that except for fake sentiments, Iran establishing UAV border patrols at the common borders would be beneficial for both countries. Google maps shows you via your own eyes that Pakistan is not ready to invest resources like UAV border patrol, not even rudimentary denser checkpoints...