I took a look at the offer on localbitcoins as well and there doesnt seem to be a user in Germany that accepts cash payments.

But I compiled a list of German users who you can trade with for $10.000+ from Germany. Here is the list:
https://localbitcoins.com/instant-bitcoins/?action=buy&country_code=DE&amount=10000¤cy=USD&place_country=DE&online_provider=ALL_ONLINE&find-offers=Search

There is also a bitcoin ATM in Munich:
https://coinatmradar.com/bitcoin_atm/6205/bitcoin-atm-orderbob-atm-munich-monte/