Finding bits from audio file?
So somewhere in signal has 1100010010010101 (50321 in binary) as 3-bit representation?


It is a leap to assume that each digit is coded as three bits. It could be a number of base encoding schemes.

Start with expanding your view of each packet so that you can see the individual signal transitions (a small time scale on the X axis). This will afford you the opportunity to test the possible coding scheme for the signal as Brian pointed out.

Once you have the coding scheme worked out, you can reduce the packet to its binary one and zero form. From there, you can determine the base conversions, etc. to find the 50321 part of the message in order to confirm that you can report the entire binary message accurately.

And in all of this, don't lose sight of the fact that most lab projects relate directly to recent lecture material. If you just studied NRZ coding for example, I would place this on the top of the list for the possible coding scheme. If, on the other hand, you are studying cryptography...