i would say "cat litter recycle paper" from brand "Breeder Celect" is the best one..look like pellet one,sure u know that one..and the packaging like this

what you have to do now is to remove those pine shavings ASAP (aka tonight) and use old newspaper as substrate while you're searching for new substrate.

pine oils are toxic, and could get into the tortoises' systems through inhalation, consumption (pieces dissolved in drinking water), etc etc.

in short, please get them away from your tortoises.

I feed them once o twice in a week, or wheneva i passby the area where i "pluck" the hibiscus