They're probably shot. At 72K I replaced everything, as one shock was leaking profusely (and I found another starting to when pulled). Of course it was a perfect excuse to upgrade to M030 ROW
YMMV as my Box has been heavily autocrossed.
The shock oil loses viscosity from heat and wear. Many 'experts' say shocks are gone by 50K and certainly 100. BUT, if it feels good to you, and you see no leaks, why worry?