Some pictures I have seen of physical crypto coins are very beautiful and might make great items to keep a long time. Are they ever really safe? Even if they use the most secure possible way to hide/protect the private key doesn't the coin creator, who funded the address, have knowledge of that key? How would the maker ever be able to hide that valuable key - inside the coin - without being the first person to know exactly what it is?
Those loaded with Bitcoin? Depends on where you bought your physical crypto and its to risky to trust those people offering this so pick those reputable people selling this coins to avoid getting compromise.
But for you and other people to be aware on past incident physical scam coin hacking @krogothmanhattan had a thread compiling those incident here
https://bitcointalk.org/index.php?topic=3315347.0For sure you will get interested to read those cases and to know the risk of what you are trying to buy.