So the idea did exist, but some may not have known about it. Another-words Joseph may indeed known about the idea since is was popular in some tales of the day. As to your other claims, you would need to provide evidence for them. What discoveries came after Joseph. You admit the stone boxes and plates came before Joseph.
Frankly I don't remember off hand the DATE of the very first discovery of plates and/or stone boxes "specifically". And a brief search, the earliest I could find was 1860.... well after Joseph Smith.
But I do remember there are PLENTY of other things that came known after Joseph for sure.
As to some examples, the fact that you aren't even aware of these things even yourself tells me maybe you aren't as "learned" as you think concerning the Church. And me, I don't regurgitate scholarship for a living. I'm a regular joe who's simply studied/study's a lot to find out things for myself. I have other talents I "regurgitate" on a whim.
Feel free to do a quick search are FAIR or Jeff Lindsay's site, etc., or Google, I'm sure you'll find some examples if it's so important for you. Of course, I'm sure you won't. I'm only relaying testimony of what I remember from my own study. You shouldn't expect people to hold your hand in the discovery of truth. I've pointed.... Now do something for a change.
And don't do the predictable anti-mormon whine, waaa waaa, the mormon made a claim and didn't provide any facts. Frankly, I post facts when I have time, and that's only maybe once a month here or there, and further, I've been doing this long enough that it doesn't matter if I or any other mormon posts facts to support their position, it's simply ignored and mocked anyway. So, forgive me if "I" choose to waste my time when "I" feel like it. The first couple of years I started doing apologetics I posted facts on almost every claim I made
, and it usually took a few hours of detail and proper research, collection and posting of the data. But, like I said, it doesn't matter how much or how detailed, you people just ignore it. So, I don't waste my time like that anymore unless I'm really interested. Sorry, I've pointed, now you do something for a change.