I would normally give my dogs fresh bones to chew but have to monitor very carefully as gsd gets very guardy over these as they are highly prized but I can get away with hide chews he isnt to obothered with them. The filled hooves were good untill they ate them in one sitting the whole lot.
Anyone got any other suggestions as to what I can just leave around mainly for pup to chew recreationally rather than my flipflops  ... again

> what I can just leave around mainly for pup to chew recreationally rather than my flipflops ... again

That's the flaw in your plan.  Ideally you want your pup to learn that stuff for chewing is NEVER just lying around - it only comes from you.  Pups will otherwise look for items that smell of you or that you seem to use a lot!!

I have a chew toy box and I hand out stuff out direct from there - I also try and gather it all back in later so I can give something different next time.  All contraband is reclaimed from the thief  by it's original owner, usually lured with a biscuit (I've managed to train the kids not to chase the pup when he legs it with something of theirs) and after a short spell of sit/stay/concentrate etc the litter lout gets to choose something from his box of bits.  I have a selection of hard chew toys like Nylabone, Tastybones, and softer things he can just carry if he wants to.  Admittedly he also steals logs from the wood pile and apples too so I cannot claim to have completely perfected this training tip!!  However he seems to really like rummaging for new stuff in his box and can always be tempted to swap if we look suitably excited too :).

A note on Tastybones or Nylabones - 2 of my dogs manage to chew/play/carry these quite successfully.  The other would chew and chew until it was a tiny stump so I still have to be careful with all his toys.

A tip with recreational bones is to give them in the same spot every time and give anxious or guarding dogs theirs in a crate or other enclosed space.  My 3 are absolute creatures of habit with their trophy items and they very rarely even look into the other dogs eating positions (one in his crate, one on the paving, one under the apple tree).  A puppy pen works well with some dogs too as the panels are flexible enough to fold for easy carrying.  I used to keep one in the garage for the puppy to eat his bones in and I'd just position him where I could sit and watch him - he used to take an hour per chicken wing - not any more!!

Now thats a good point thanks for that BaB I can see what you mean. I willl change how I give out the chewy things and will see if she is more excited to see them and two is less likely to pick things up to chew. Fortunately I run a fairly tidy households kids bedrooms aside and they shouyld keep doors shut but accidents do happen. My  point though was for her to have fun chewing the right thing sometimes I just think she needs to chew something and I can fully understand what you have pointed out as my error.
I have ordered a stag bar to see how she goes with that as long as gsd dosent get it first and goes and buries it. Funny he only bothers will real bones or takes other chewy things and buries them i am sure we have some hooves buried somwhere in the garden and have just found a hide bone form years ago
It would be better to give bones in a crate which I will do with her but not big boy as he know longer has a crate and probably wouldnt fit in my big one now and will only eat in the garden. Will have athink about him and encolsed spaces. He really is protective over these and I am not sure how far he would go and I certainly wont push him to find out 
Yes if she picks anything I dont want her to have we play swaps and she is good with that

Off pet shop and find suitable box.