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!
Are they still on the address of the coin?
I don't know, I haven't looked at them since 2013. I don't even know where to check a litecoin address. If you give me a link I will check later in the evening.
search for a ltc blockexplorer, and please DON'T INPUT THE PRIVATE ADDRESS SEED, but ONLY a public address, look at the format of others public ltc address and be sure it is the same format

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edit: check with others before doing anything, because I never did that... just to be on the safe side

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