You did well getting any of these pictured notes for $10 apiece. The Babel note is a great find.
These notes used to be 'common' perhaps 50 years ago, but now stocks disappeared some time ago, and they are now found when they come out of collections or small hoards. Even circulated examples are even garnering decent prices, especially in clean VF and better.
These large European notes were invariably folded, to fit into large wallets, right down to pocket sizes, so AU and UNC examples are really not common, and F or worse is commonly seen.