Don't discount the effect of bouncing, vibration, heavy shifting on automated sorting systems, etc. that can aggravate the effect of temperature changes as well.
Repeated temperature shifts can allow pressure to build up in a tin from slow seepage, and increase over time. Just a small amount of pressure differential combined with alot of vibration, bouncing, etc. can certainly pop a tin. Round ones are more resistant than square or rectangular ones (threaded lids and all). But, not unheard of.
I've had this happen once or twice and was very lucky that the package was packed in such a way I lost less than a bowl of blend from the experience. Unless the whole tin was a loss, I'd just photo and send it to the vendor so they know it can happen. Lose the whole tin? I'd see if there was something the vendor could do.