Real Plumbers think ahead and that they may just need to access something in the future. Perhaps you are mistaking plumbers for that curious breed, usually referred to as 'bathroom fitters'it might be wedged in, under the lip of the bath at the top, and pushed against a batten at the bottom. If you can pull on the bottom edge with a rubber sucker or your fingernails, it may come out.
Some plumbers like to glue bath panels in with silicone.
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