I received a neck from China that was bought right before their Lunar New Year which also brought in the COVID-19 problem. Shipping was delayed because of the extended holiday they get plus by the time they returned to work on 2/10, their quarantine was in effect. I finally received it after about a month. I was somewhat concerned about the virus given the origin of the package so I planned a procedure of opening it and getting to the neck which consisted of first spraying the outside of the box with Lysol spray and each piece of bubble wrap as I got to it, plus spraying my hands and drying them after disposing of the box and packing materials. When I got to the neck, I sprayed it inside and out and wiped it dry. I put it aside and didn't begin to fit and play it for about a day.
For a whole sax I would basically do the same thing. Lysol spray doesn't harm lacquer or anything else on a sax although I would want to oil it after it dries. On a used sax, especially one over a year old, you are going to be faced with a 'slime' build-up in the neck and body that really should be washed out as I think this could harbor a virus for a long time. Of course the sax has to be torn down to do this.
This is not a casual thing considering how sick you can get with this bug.