Wait a minute, allow me to analyze this saying: "Your Private Key, Your Coins" So if you got the chance to get any private key of any address that has funds, you are it's owner.

Are we talking about this particular puzzle addresses or in general? If it's in general, then one might say : " if you get a chance to find a woman alone, you can have her anyway you like"  what if that woman is your wife, sister, daughter  or mother?

So no, if you find any keys with funds, unless it's a puzzle key, you should not touch them because they're not yours, so hands off the merch.😉

When you find a puzzle key, you better erase yourself from online world and gradually cash out without using any CEX, if you were "lucky" ( yeah, right ) and by chance you found it, better to explain how you found it and be sure to have a good story to tell.  Then again, gradually cash out and enjoy,  IRS wasn't lucky, you were, therefore you deserve it all.

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Anyways, you should seek legal advice from experts, in here we only see golden coins where ever we look, so we are in a sense mesmerized by medusa, or rather by a gold hoarding dragon.