Loads of very valuable coins from Poland if you go back about 200+ years. The coins under Russian rule, old Thalers etc etc. Depends what you find
I see nothing of value in the tin, sadly. They are cool though, but nothing silver. Just modern circulating coins.
Just regular coins, currently in use. You can look for those which are from 1990 and in a very good condition, but i'm not sure if it's worth your time.
There hundreds that go for 100K++++ 1621 AV 100 Dukaten 5M Here is one of mine.... AV 2 Dukaten ND (1678) John III Sobieski King of Poland Danzig