Awhile back I read a thread somewhere on here that some company did just that.
i.e ...actually engraved the priv key with a sealed hologram or some such thing and sold
the various bitcoin valued coins they fabricated.
And guess what ended up happening?
Not too hard to figure out...lol
You mean the Casascius coins? Lots of those still out there unswept, they are legit.
There was a guy named Coinhoarder on this forum that did a litecoin "Casacius" in 2013, I bought three from him and then forgot about them until now.
Just found them again. So yeahh I have three litecoins!