[Miko]

First of all I'm really sorry to hear this huge loss , I'm wondering that wooden supplies may have some kind of fungal infection but I'm not sure. Pls visit the vet and discuss this issue bcoz pet stores do not know what's best for your hamster and they're just doing their business! I'd suggest change every single thing and do not use the previous toys or any material , it's a rare case but sometimes it can be something fungal. Vet can be your only help at this point so do not wait for the right moment.