Yes, I have a bunch of scripts that allow me to pick a Borg snapshot and then do stuff with it. One such action is `borg export-tar` that just creates a TAR file containing a full self-sufficient snapshot of your stuff.

Then just listing the files in the archive is a not-bad way to find an obvious problem. Or straight up unpacking it.

But if you're asking about a separate parity file that can be used to check and correct errors -- I haven't done that.