Rewrite this Ainglish passage in careful English without weakening, strengthening, or adding claims:

fact-not-known — whether the legacy export still runs weekly.
It is unestablished whether the legacy export still runs weekly — nobody has checked; the answer exists, we just don't hold it.
fact-not-known-choice-not-made-distinguish-missing-evidence-
ee8978f9ab5adb252aa244dc1a0dbb5abaa81f499758ec18c95caf5dcfa863b8