Though I agree with Sherry and Kariminger that obviously EA's ownership of .packages supercedes any contract between other parties, there is just zero way to get said files.
I'm not sure if I would take a cc commision or not, but if I did and the person did not want me to distribute the files I wouldn't.
LOL that is why I won't be offered up any commission any time soon. As soon as the mesh is in the .package I would share it. They only way they would be able to keep that baby exclusive is if they didn't want me to .package it for them and if they are going to go that route then I would suggest getting a done by a more talented 3D modelist (word?) who would undoubtedly do a better, faster and cheaper job.
I think it's hard to say though there is no possible way to profit from commissions that would be legal. Buying selling models and textures are all legal. Models and textures are the hardest and most time consuming part of making an object. As a creator you own that work and can charge for it. If I were to make a whole bunch of vacation themed models I could charge for the models. Infact there are plenty of sites dedicated to making low poly tanks and guns that people buy for other video games. That is why I have always said to creators who complain about the time and efforts models take to just sell the freaking models if they are so concerned. Don't put it in the .package and make sure your agreement with the buyer very clearly excludes any distribution of the model.
Which OT a bit is actually very funny because alot of these model that people pay for (or steal) are only supposed to be used for renderings or the likes. They clearly are not supposed to be distributed or profited from as models. If you are distributing a .package file, you are also distributing a model (it takes .2 seconds to extract), and if you don't have permission then congrats, you are breaking more contracts than EA's.
I personally don't see any problem with someone who was dying to have a certain bed or sofa ect. in the game ask and pay for someone to make them that model. I don't see that problem with after someone made them that model and payment was complete that they or said creator put that model and it's textures into a .package file. Hell before I could create I would have considered doing that myself. Personally I think that is better than going out and just purchasing a model because you know the creator of the model is giving you permission to add it to a .package and therefore agrees to EA's terms of use. So long as both parties are aware that the .package can not be charged for and if someone else gets ahold of it, it's fair game, then I don't really see anything wrong with it.