recover hidden archive groups/items

I go to the menu Tools > Archive. I get a display entitled
“Archive: 1 groups, 118 items”.
The display has 4 parts: a tool bar across the top, on the left a list of groups, on the right top is is a list space for items of a selected group, and on the right bottom is a pace to list the text of a selected item. The group list shows one entry - a folder icon and a title followed by (61). I select the group and I see 61 entries in the item list and when I select an item I see its text in the space below.
How can I recover the remaining 57 items for use with Agent? :question:
They were in 3 groups. 2 of the groups did not reappear after a crash and 1 group did not reappear after I Quit the program.