the lapisia cubes are tradeable already
they have been since day 1.
Mboxes are a waste if you get a PAL/PWL higher than the enchant that you need.
Now, some people, including myself, have refused to put our necks on the chopping block once again because of the non-tradeable status. items take time/risk to make to the levels that they are at and sometimes even a fair and equal amount of OP compensation doesn't quite cover the loss/value of the item to its owner when they have to return to the PvP zone they were trying to compete in minus 1 or more pieces of gear. getting scammed 1x is enough to teach you something.
Quite honestly, there are only a few in my own guild and a small handful outside of it that I could trust to hand over my gear to buy an upgrade. Other than that, if they dont have them (the PAL or PWL lvls I need), I will just have to wait. I refuse to buy these PAL/PWL outright because they are in support of scamming others, and I simply do not agree with their current non-tradeable status.