You shouldn't, they have quite the reputation. I've delt with people who brought in signed jerseys when I worked with Jersey City, and got the jersey crested.
There was only one instance, not sure if they were with Great Plains yet. A guy brought in a retro Reds jersey looking to get it crested with Pete Rose's name and number. Never came back... and there were issues with it.
Over the 3 or so years of working in the Jersey selling industry, I sent out dozens of jerseys a week, and only had one go missing.
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