I live in Belgium and in August went to Dusseldorf on a weekend trip. As an autistic adult I have a EU Disability Card, which is a new trial project by the EU, which is only valid in 8 countries, one of which is Belgium. Germany notably isn't one of those countries. Still, I showed the card at the ticket booth for a local museum, the K20 museum for contemporary art, not knowing that the card was only valid in the 8 countries the trial is active in and thus wasn't yet in use in Germany. I assumed that given that it was a European project, it would be accepted as proof of disability, and I would get the 10 EUR discount ticket for disabled people instead of the full 12 EUR ticket for adults. The cashier apparently didn't know what to do with the card and waived my ticket price entirely.
The question I have: is what I did considered a crime, like fraud or theft? or should I just not worry about this? After all, the museum did have a discounted ticket for disabled people, and that card was proof of my disability, just a proof that wasn't commonplace yet in Germany. The cashier was within her rights to give me the 2 EUR discount or refuse to accept the card, but instead she waived the ticket price entirely, so