In some embodiments, provide apparatuses and methods to track item containers. Some of these embodiments include systems to track item containers, comprising: an audio detector positioned relative to a parking lot associated with a shopping facility and configured to capture audio signals generated at one or more predefined locations; an audio evaluation circuit to: receive the audio signals; and identify when one or more audio signatures correspond to one or more distinct predefined audio signatures that correspond to movements of a first item container relative to the one or more predefined locations; and a control circuit configured to estimate a quantity of item containers at the one or more predefined locations as a function of identifying that one or more of the audio signals include the one or more audio signatures corresponding to the one or more predefined audio signatures.