The chances are that, unless your money is basically fresh from the mint, you have a mixture of sources that provided it. One way to demonstrate this with coins is to look at their reverse. I only have a limited number of Euro coins at present but It seems that from any given country all the cent coins have the same reverse but the one and two Euro coins may not then have the same reverse as the cent ones. Certainly, if the cent coins you have are different on the reverse then they come from different countries and similarly for the €1 and €2. I have not once in many dozens of months spent in different Euro countries ever seen anyone check any of my money, coins or notes, for where they were issued. I have experienced people checking larger notes (€50 upward) to see they were genuine. Apart from just the first year or two of issue, I have consistently ended up with a complete mix of origins for coins - I simply cannot believe anyone generally knows or cares as to where the notes were issued.