I was able to jump on this socket lot on eBay for what appeared to be a WF-120 3/8" x 3/8" deep. I could only read the 0 in the part number from the pictures and took a chance and it was! Closed another gap in the WFs.
Also was a Bonus 7/8" PWA SP socket that I didn't have have as well.
It...
A few more to add to the wall. Mostly 1/2" drive 6 Point Power Drive Sockets.
Before
After
I am still missing 2 shallows 3/8" and 13/16" and quite a few larger deeps.