It's extremely difficult to strip 20 lug nuts unless the lug nuts were made of bad metal. If you use the wrong sized socket, you'll know on the first one and you wouldn't continue using it on the rest. If you used the correct size socket, you'll break the studs before the nuts will strip. I'm kinda skeptical that they were stripped at all.
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Tesla lug nuts are very fragile. The thin steel cover that caps the nut is very easily distorted. The description itself indicates the nuts were not "stripped", the conventional definition of which refers to threads, but rather that the thin steel cap was distorted. I can't understand why Tesla is still supplying these crappy nuts, when there are solid nuts which are almost impervious to damage. I changed both of our cars some time ago -- and Tesla whined that they were not OEM and that it might, in some unspecified way, "void my warranty".