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I wouldn't worry too much about the lack of shedding. A BP will shed when it needs to. Have you been tracking the weight if your snake? A BP really only needs to shed when it outgrows it's old one, so if the snake hasn't grown significantly then there is no need for a shed.
Signs of an upcoming shed include:
1. Pink belly
2. Dulling colors
3. Bluish tint
4. Increased aggression
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