So here is the update, the tab key as it was rendered did not exist as a mold, so they have to make a new mold in order to make the key correctly. It does exist for the cherry font but not for the Gorton font this set uses.
I discussed with the other vendors and we decided to wait for them to make the correct keys, instead of accepting them as is. It turns out they do not have enough material in order to remake the keys correctly, so we are looking at about 7 weeks for the new material to arrive in order for the correct key to be made.
One that I did notice when I was comparing renders to made keys, was the 1.25u R4 Control Keys (someone on Discord had also DM'd me about this), I had submitted them to be made as CTRL because on 1.25u I find Control to be a bit cramped looking when compared to other keys like Alt, FN, etc. But on the renders for the set it has it as Control. So please bear in mind that the set will actually have "CTRL" on the 1.25u Control keys and not Control as rendered. I have verified all the other keys against the images I received from SP showing the completed keys, and they were made as expected.
Once I have a new timeline from SP, I will update here with the new expected ship date from them. Hoping it will be sometime in September at the latest.