picture in post #5 seems to be from another side, it has signs of some blunt object pressing against the boot and making a tear
Somethings the boot will split without any problem with the CV joint. I had both outer boots on my VW Rabbit split at the same time, only about 3 years old. Oil got on them , the rubber deteriorated, and split. Please donāt ask how oil got on the boots ā¦ lol ā¦ The Rabbitās replacement boots, lacking the oil treatment, were still in excellent condition 7 years after I installed them. I had to replace both outer boots on my now-27-year-old Corolla at the 12 year mark. I noticed last time I changed the oil the replacement boots are looking a little āiffyā too. The inner boots remain original to the car, and the rubber appears to still be in good condition.
Well I got the car back today and he put new axels on both sides so hopefully they hold up this time. I still donāt know what happened to the last pair.
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Iām pretty sure it was the joint that ruined the boot. The mechanic said the left side axel was worn down and I even saw metal shavings inside the boot
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Well . . . ?!
a recently described āforgot to put the drain plug onā would not explain that 
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To do that much damage from running over something would have done damage to the oil pan and transmission also.
Looks like the boot was made of the wrong material and was disintegrating.