It can also be that they seem to light up because of false light from underneath.. Is there a huge difference when you actually switch ON the particular function? Just thinking the unit may be OK, though it's not good to have doubts about these indications.
And I wouldn't worry too much about the Covid biohazard. If you pack the unit after cleaning it and washing your hands - plus the time it will be underway, I don't think any virus would still be alive.. And the receiving party also has a responsibility..