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It's next to impossible to check a CV joint for wear - particularly without removing it from the vehicle, cleaning out all the grease, and giving it good inspection with feeler gauges. If the boot was broken, dirt got inside. It's hard to say how much dirt and how fast it will wear out the joint, but I've found that once a boot fails, it's just a matter of time before the joint fails too. Even if you replace the boot and repack with fresh grease, the slight amount of wear already there will cause the parts to clatter about and wear out anyway.
I would say that if you caught the broken boot very early, you could still have a lot of miles left on the CV joint, but it's rare for anyone to catch a broken boot that soon.
Drive around slowly with somebody walking next to the car listening for where the sound comes from. I'd wager the noise will come from the same CV that had the broken boot.
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