The Ebay pic is a Becker Sound 10 that appears to have 5 Presets.
My Becker Calculator calculates Presets between 4 and 9 inclusive
If you say yours only has 3 then I`m afraid that can`t help you any more.
You`ve got the codes for Presets 4 , 5 and 6 so if they don`t work then you are going to have to seek advice from a Becker or Radio Decode specialist ...but it won`t be free.
Perhaps time to look for another radio with code?.
I assume that you are entering the code correctly?
Is it this method?
The screen should show CODE * * * * with the "C" flashing
Use the +/- keys to set the first digit of the code onto the screen and then press the "M" key to move to the next digit. Repeat the process until you have all 5 digits of the code on the screen and the press and hold the "M" key to finally enter the code. The radio should now operate.
RegWorts
July 2008