Rusty part in the engine compartment with new car

Hello together, I bought a car as a day registration, with first access 09/14, and I have now found a rusty part in the engine compartment. Okay, the car was probably 9 months out now, but why is only one part rusty and why so strong? Is it perhaps another material or do you think something has been changed here and just used an old part? Also the one screw looks very rusty. Remember that the car may not be as new as the dealer said…