Excellent tips / strategy as not damaging the many little embedded fasteners is very difficult and a "tell" for WD to deny warranty coverage. I stored the "giblets" consisting of the USB-SATA interface, bumpers, LED light pipe, etc. in a sandwich bag alongside the cases (whose laser-etched serial # has to match that of the drive inside the case) in a tote with a expiration date on the outside.
After the warranty period ran out, I recycled the still-pristine cases and contents in the local trash pickup. However, I found a even better use for the innumerable power supplies by sending them to centerclick (https://centerclick.com/ntp/
), makers of the excellent NTP 200 server. He uses the same type 12VDC power supply.