I agree.
That decision was clearly incorrect.
In such cases, intention relates only to positive knowledge of possession. As a question of fact - he was clearly in control, knowingly, of the ammo.
Masipa wrongly looked at cases where the accused takes no action to posses (e.g. someone puts a gun down next to you) or the accused does not intend to possess. e.g. you find a bag of cocaine at your front door and telephone the police to come get it.
Otherwise as you say, you could hold drugs or guns for someone else - but have no intention to possess?
Absurd.
it also seems absurd that, having had time to reflect, masipa is standing by this decision. especially after giving leave to appeal the main count.