Update: got mine as promised. They weren't in plastic bubble packs, but wrapped in brown paper. There were no obvious signs of previous use and were pretty clean when I wiped them down. I didn't find them as hard to load than my mags that came with the gun-perhaps they were just lightly used?
They slide and engage as expected and cycle properly and lock the slide back after last round.
Overall, I'm happy. I think it's safe to go with this vendor for small things like this.
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