Recorded Audio / Still in Package Contents After Deleting

I accidentally started recording some audio files in my outline, so I deleted them. Out of curiosity, I went to Show Package Contents and the audio files are still there. Is this a bug? I even saved the .oo3 file, closed it, quit OO, opened OO, and opened the .oo3 file again. The deleted audio file(s) is still in package contents.

Is this because of Versions?