Dreams about rummaging through items often reflect a search for something in your waking life, such as clarity, self-discovery, or even unresolved feelings. The brown mules could symbolize comfort or stability, as shoes often represent the path you are taking in life.
The panic you felt when the bag went missing might indicate concerns about losing something valuable to you or feeling insecure about your possessions or choices. This could relate to feelings of competition or comparison with others, especially if you felt that they were securing their own items while you were struggling.
Finding another pair of shoes in different sizes could suggest that while you may have found something that seems similar to what you were looking for, it may not fit your needs or current situation perfectly. This might reflect a feeling of inadequacy or a realization that certain opportunities or choices are not a perfect match for you.
Consider what aspects of your life you are currently searching through and whether you feel secure in your choices. It may be beneficial to reflect on what you truly value and how you can secure those things, both materially and emotionally.