Dorcus Owner's Shop SRD Larva Block 3600cc (5 pieces)

This is a mushroom substrate block purchased in early July this year.
My stag beetles did not breed and passed away, so I no longer need this and am selling it.

It was stored at room temperature, so it may have deteriorated.
I don't have much knowledge about it and can't tell if it's good or bad, so please judge from the photos.

Thank you.