Were those lowers AP lowers?
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I'm fairly sure it is Type III hard anodizing, I just find that some finishes chip more easily than others. It seems like the duller near-black anodizing is often a bit tougher than the less-dull pure black, but I don't know if this is coincidence or has a chemical basis.
I bought my first stripped lower locally and got soaked, the lower was fine but price was ridiculous $145 plus tax for a DPMS. I only order online now and have them shipped to any ffl who will do the transfer, I just got 2 spikes tactical stripped lowers from AIM FOR $79, free shipping and a $25 transfer fee from my ffl. So all together with tax I paid $158 for my first which was the total for 2 from AIM not counting the transfer fee. Also Ive had some ffl's in my area refuse to do a transfer because they have them in stock so "why would they want to do that" sure why would they wanna only get a few bucks off a transfer fee when they can soak people for double.