If they are not cracked when you buy them and he takes the normal precautions when drilling, I forsee no problems.
Many people, myself included, have bought, via the internet, that are more than 10 years old and have used them with no problems. Plus these have been delivered via FEDEX or UPS cross country, sometimes in the heat AND humidity of summer or the cold of winter, with no problems, again.
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"None are so blind as those who will not see."