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How to find a past coworker from a retail job
Create a social network with coworkers whom you have established good relationships with.
Assuming you have become friends and no longer mind sharing personal information, find out their phone number, email address, facebook account, etc. This way, if they move on from the company, you will know how to get in touch with them.
Search for the coworker online. Especially in today's technologically-advanced times, this is an easy way to look up information about them.