Best way to restore objects with correct names w/o git log present?

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+# Best way to extract git-annex object files (with correct names) in absence of git log?
+
+**Issue**:
+
+  * any git log is missing, so restore not viable
+  * annex directory is empty, i.e. no symlinks (.git/annex present, though)
+  * annex A: .git/annex/transfer/download/failed contains files
+  * annex B: .git/annex/objects contains files
+  * git-annex fsck -A: checksums files present
+  * git-annex fix: no change
+  * git-annex sync [--content]: on B fetched objects, fails on A (iirc)
+  * git-annex find: nothing
+  * git-annex unused shows couple of files on annex A and B
+  * git-annex addunused && git-annex unlock makes them available but filename is missing: "unused.SHA256E-[...].pdf"
+
+**Question**: any chance of restoring those files with their correct names?
+
+Thanks i.a. for any recommendations.