You can see in the 2nd photo there is an extra port on the back, looks like parallel/SCSI/something? Not too familiar with these. He thought the memory had been upgraded as well, but I don't have a way to check that yet.

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That would be a SCSI port. I have a Macintosh ED with similar upgrades - two Dove MacSnap add-on cards that add extra memory and a SCSI port. Yours might be from a different brand, but the idea is the same.

But that's a really nice find. Talk about classics, the 128k Mac is the mother of 'em all. And you bought it for a very good price too, I'd say this model is relatively rare, especially in good working condition, so its collector's value is pretty high. I would almost advise you to remove those upgrades and bring it back to its original state, just out of principle.