Try this:
Dim strwhere As Variant
Dim varItem As Variant
If Me!Your List Box Name.ItemsSelected.Count = 0 Then Exit Sub
For Each varItem In Me!Your List Box Name.ItemsSelected
strwhere = strwhere & "'" & Me!Your List Box Name.Column(0, varItem) & "'" & ","
Next varItem
strwhere = Left$(strwhere, Len(strwhere) - 1)
strwhere = "[Auto_Box_ID] IN (" & strwhere & ")"
DoCmd.OpenForm FormName:="frmIssue", wherecondition:=strwhere