Confidence: It's likely to be this, but I can't be certain.
Notes: bristled fine granular pincers with pincers slightly different size (right larger) - this not so pronounced as bernhardus. 2 an 3 legsappear to be grooved and not spiny (spiny feature of bernhardus). Location and size right. Agree it's likely to have swapped it's home by now (doesn't look like a shell).