Intuitively it seems correct that it should be locks that only I have keys for, in other words what I've been using all along. Since these cases can be used for other purposes, e.g. camera equipment, it makes sense for TSA pin-type locks to be manufactured to fit this type of case.

I wouldn't have even wondered about using TSA locks except I saw them "paired" with the case on Amazon and two TSA agents specifically stated that a TSA lock is preferred, one even made that point when returning my keys (which they obviously don't possess) the last time I checked a firearm.