I will be surprised if they cover it under warranty. We use to tear those things up all of the time trail riding with our Sportsmans. We would tear at least one every trip, so we always had a spare one with us so we could fix it back at camp. They usually rip from twigs or brush that gets up in there and puts a small cut in them that you cannot see and then after awile of riding they bust open. Once you see this I would stop riding ASAP because if you get sand or rocks up in there you will end up spending allot more money.
Get a CV boot repair kit from the dealer. It cost me araound 35.00 with my discount. The kit will do 1 inner and 1 outer boot. The outer takes all of 20 minutes and you dont have to pull the axle. The inner will take a little longer. Cheap insurance to carry with you so you dont ruin a weekend of riding.
Has anyone tried greasing the outside of the boot. I used to drive (still do, but newer one) a lifted toyota pickup with the torsion bars turned way up causing the CV's to turn at a pretty steep angles. I used to grease the boots because sometimes the friction of the rubber on rubber would tear the boots. I could try it on the 700XX to see if it helps. I hadn't really thought about the CV boots before this thread was posted.
Also greasing the outside of the boot would only attract more sand, dirt and even rocks into the grooves.
Save yourselves some time by ordering the part as soon as you get there. This way you don't have to wait for Honda to approve the part and even longer for it to ship. I got refunded the money after it was all over.
Also I'm positive nothing got caught up in there, I was on some 100' wide ass hauling trails.