Search an entire Google Sheet for a value and return true/false

I need to search every sheet in a Google sheet for a value - currency - and return true if it's found. The code below is returning false for everything

function searchForNumber(value) {  var sheet = SpreadsheetApp.getActiveSpreadsheet().getActiveSheet();  var data = sheet.getDataRange().getValues();  var searchString = value;  for (var i = 0; i < data.length; i++) {    for (var j = 0; j < data[i].length; j++) {      if (typeof data[i][j] === searchString) {        return true;      }    }  }  return false;}

Please help.