Overall, it's a great drawer, I have two of them: one for Sennheiser paddle antennas and the other one for handheld mics and bodypack transmitters.
Thomann has foam inlays for Shure and Sennheiser. I got one inlay for paddle antennas, the other one, for mics. They fit perfectly.
Downsides: the latch mechanism is not 100% reliable, so your drawers may open during transit between gigs.
I never used the included key. Probably, it will not open if you use the key, but I never did. In total, 5 out of 5 stars.