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Did you mark the cooler before you shipped so you can identify it? Was there a reason you sent it for service?
I understand it's common to use a mail-out service for these in 911 circles due to community habit and widespread recommendations. However, unless you've had a metal scattering catastrophic failure, you should be able to clean/flush it at home with the highest level of confidence using diesel fuel and filtering each discharge with a clean white cloth like an old T-shirt.
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“Of the value traps, the most widespread and pernicious is value rigidity. This is an inability to revalue what one sees because of commitment to previous values. In motorcycle maintenance, you MUST rediscover what you do as you go. Rigid values makes this impossible.”
― Robert M. Pirsig, Zen and the Art of Motorcycle Maintenance: An Inquiry Into Values
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