What did you expect to see on the small flange fixing bolts? You state you saw no threadlock on the threads YET the bolts appeared to be "torqued correctly" as far as you could judge and were tight. But observing the tight condition of this bolted joint, what BASIS do you present to support your opinion that the bolts "would probably have come out after a few years"? There is absolutely no reason to jump to that conclusion, that I can see. Help me understand your logic. I would opine the bolts would continue to maintain their torqued preload until an untorquing force was applied to the bolt head. The axle bolt recall many years ago on our cars was NOT caused by a lack of threadlock nor was it caused by improper torque on any of the bolts.
I welcome your response thoughts.