In Process Bulk Sampling

Dear Forum,
I work for a Medical Device company. We produce bone graft putty. For one of the products our batch size is around 3000 g. We determine Density to the Bulk, using 3 samples from different areas . We got an observation that 3 samples are not representative. But I have the knowledge that for Bulk product we just need take samples from middle, half and bottom, because taking samples from different areas we can prove the product is homogeneous,am I wrong?. Is there any guide for sampling Bulk for density?
Thanks in advance.

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