I think you're reading way too much into it. Makes sense to me (finding it in the rat's nest). I found a lot of neat old treasures in the basement of our EE department back in college when they cleaned it out. Heaven knows what the kids will find in ours when they clean out the house after we are gone.
I have a vague memory of an LNP-1 that was nothing like the LNP-2, his first commercial preamp, but my memory is very foggy on this. I'd guess the LNP-1 and/or other pro stuff couldn't compete with the pro audio gear already in use at the time so he switched to the consumer market. Does not mean it was worse, may have been better, maybe even a lot better, but not the direction ML chose to pursue. I agree with
@waltzingbear that you may have a very rare item. The original Philbrick op-amp is a terribly clunky design by today's standards but I'd love to have one.
I sooo wish I had paid more attention to Mark when he came by the store I worked to set things up when they picked up the line. He gave a little talk about his background and goals; that was probably around 1980, when I knew it all, and his stuff was way over my budget. I don't remember much of it, and at that time I was the tech kid in the back and not on the sales floor.
Anyway, I don't have any more facts than anyone else so far, and don't need more grief in my life, moving on.