For the archives - this can be dealt with. Technology courtesy of the marijuana growing crowd and used car detailing crowd. The answer is in a product called an Ozone Tube or Ozone Generator. Ozone is great at breaking down odor causing pollutants in the same way the sun's UV rays do. Ozone tubes / generators create copious amounts of ozone and allow it to directed / distributed to control and eliminate odors. Marijuana growers use them to control the horrendous stench of a grow room. Used car dealers use them to clean up offensive smelling vehicles which is MOST used cars.
If the OP were to place the cabinet in a small room or closet with an Ozone tube for a couple days, the smell would be significantly diminished or completely removed. The problem in this case is that the OP has 2 days to work it out which isn't likely. But it could be dealt with. If he likes the cab, he should get wit hthe seller and propose an extension of the trial to see if this could be worked out.
I passed on a killer marshall guitar stack for this same reason about 10 years ago. This was before I knew about ozone. Wish I had THAT decision to make again!