If they are truly missing hen they have been deleted and can only be recreated which is quite easy assuming you have some reasonable idea of the filter that defined it. But before going there, try the following:
click on magnifying glass
at the bottom click on boards
search by name or scroll thru
if it is gone then recreate:
create a filter that defines your board, save and share
click on magnifying glass
click on boards
click on create board and choose from existing filter
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