Hi
There is a thread on enrichment stared a little while ago. If you go to the right top corner and search enrichment it should come up.
Ours like to carry old pieces of hose pipe around, they haven't taken any notice of footballs, kongs or other dog toys i have offered them. They have an old tyre but are more interested in the rope attached to it. But give it ago each to their own.
They will probably enjoy rooting around their enclosure if the earth is soft enough, ours have given up at the mo as it has been very dry and hot here in Kent.
Good luck