Of the handful of 400K drives I've come across, all had seized due to the lubricant drying up. Recall a site which detailed where you needed to clean, but can't find it any more.

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About fifteen years ago I had a pair of 400K drives new in the sealed anti-static bags, which I had bought with a lot from an Apple Service Center. Both of those drives were seized up.

So those drives seize at the drop of a few years or maybe a decade. A little alcohol to clean the old lubricant-turned-to-varnish and a little lithium grease fixed them right up.

I'd consider the 8MB RAM upgraded to be a nice score! At the very least it makes the Mac usable, and it's still a 128K 99.9% of the way.

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I don't see how it could possibly be 8MB of RAM. The Mac 128/512/Plus can't address more than 4MB. The address map doesn't support more. Maybe if someone rewrote the ROMs, but I think it more likely that it's a smaller RAM upgrade.