Have you got the coffer (and motifs) from it? I haven't got any and I've done it multiple times after patch with my main (and only char). I know its only once a week but shouldn't it have been reseted at least once now?...Is it possible I got just really bad luck or is my character bugged somehow. :'(
There seems to be a bug in reset timers. The timer resets now every time you turn in MOL quest in end. So don't turn in quest every time you do the trial, just once a week. Heres more discussion about this:
https://forums.elderscrollsonline.com/en/discussion/285870/maw-of-lorkhaj-weekly-coffers-not-resetting