USR369 asked me to search the old-zips archive for pre-existing/more-complete versions of 5 flagged Tech library pages (Tech_Library_UI, housekeeping-library, script-library, navigator, android-library), and to build a browsable sandbox index so he could compare live vs archived without me overwriting anything. Used systems/old-zips-index-api.php (fast FTS5 discovery) then systems/old-zips-search-api.php (to get exact extraction paths) against the 263-zip old-zips archive. Found archived candidates for 4 of 5: HousekeepingLibrary_v1.0.html (47,297B vs live 33,773B, correctly titled, has an extra Android tab + 2 empty placeholder tabs not present live -- best lead), Tech_Library_UI_PREV.html (55,761B but internally titled 'Housekeeping Library v1.0' -- false lead, a mislabeled shared template not real Tech content), ScriptLibrary_Housekeeping_v1.0.html (27,064B, smaller than live 31,260B -- live already more complete), CAI_Navigator_Master_v1.1.html (56,727B, about same size as live 57,532B -- low priority). No archived match found for android-library.html; working theory is it used to be a tab inside the combined Housekeeping library page rather than its own file. Built frontend/30-Tech/sandbox/archive-review/index.html linking directly to both live pages and the archived files in-place (systems/old zips ref/_extracted/... is directly web-viewable, confirmed via HEAD request, so no copying was needed). Page also embeds a full search-log breadcrumb (tool names, exact extraction paths, what was tried, what's not yet tried) so a future session can resume the dig without re-deriving any of this. Also resolved a standing open question: confirmed frontend/30-Tech/apps/Database_PREV/ does not exist live (404) -- the name is real but it's the OLD per-system archival folder convention (ARCHIVE/Database_PREV/) from pre-decade-code CAI versions, not something that should exist on the current live server.