At my request, EK also sent a backplate for the GPU block, which you have to buy as an optional extra. Unlike the more premium Quantum line, there is only the anodized black aluminium backplate option. Packaging for the backplate is similar to the block itself, though of course much thinner as expected. There is a seal on the side, and opening it reveals a separate layer for the installation hardware, with all other included items inside the main bulk of the box itself.
We once again need to use an online installation manual for the backplate and get another universal mounting set. The manuals for both mention that you will not need to use everything, but I would have preferred an included hard copy. This is all the more confusing with the thermal pads, of which there are seven across three sizes you will mostly use if pairing this with an RTX 3090 reference PCB that has memory modules on the back.
As with the GPU block, the backplate comes inside a plastic wrap that has the same tamper seal on it. We also see that the backplate is between two pieces of thick paper to further protect the finish, which is nice. The CNC-machined backplate is a full-cover one that protects the PCB from any inadvertent damage due to solid or liquid spills.
We see an EK logo with a protective sticker that has to be peeled off in the bottom-right corner, and a closer look reveals the machining marks, which I already know some people will complain about. I could not care less personally since you don't see these once installed, and the backplate's surface is smooth enough to the touch. The contact surface is where such things matter more, as the backplate also uses the provided thermal pads to further help with heat dissipation from the back. Engravings on either side of the recess accommodating the GPU core and other components soldered onto the PCB say this is indeed an EK-Classic product made for the RTX 3080/3090. While there are more machining marks here, these are buffed for a smoother contact area with the thermal pads and, in turn, any VRAM/VRM modules. As seen above, some sections are raised to assist with this.