You can download and try Audacity software (free) to analyze your audio files. You can set it up to display a "spectrum output" that will show you the dominant frequency in the tones. You might need to play around with the program a bit to get comfortable using it and its features, but its quite good. One trick you can trim the unwanted part of the file... you can also copy and paste the tone transmission on to itself to in effect lengthen the transmission. For example, if you have a one second tone burst, you can copy a good solid sample of that tone and then paste it over and over again onto itself and create a tone of the same trequency that is as long as you like... certainly log enough for a program like Audacity to settle in and give you a steady output.
Also, you may find the tones are "off" a bit... and do not exactly line up with standard tone frequencies. Once you get an idea what the tones are, Two Tone detect will let you specify a tolerance, so you can "loosen up" the detect slider to get the its.