Extract Lot and Expiration Dates

I have attempted to create a script that will fill in the lot number boxes on the fulfillment page.  Or at least suggest which lot numbers they should be using.  Right now I am at the point in this script of just pulling information from a saved search I have created.  The issue is, I cannot seem to pull the data correctly as I keep getting null values.  Can anyone give me a fresh look at this code and see where my errors might be?

 function pageInit(type, name)  {        //first get list of itmes      //then on each item search for what lost numbers and qty are avail      //populate that field      var lineNum = nlapiGetLineItemCount('item');      var counterOfLines = 1;      while (counterOfLines <= lineNum)      {          var lineItem = nlapiGetLineItemValue('item','item',counterOfLines);          var lineQty = nlapiGetLineItemValue('item','quantity',counterOfLines);          //alert('The line item for this record is: ' + lineItem + ' on line ' + counterOfLines + ' with qty ' + lineQty);                    //now run a search for each line to grab a lot number          var filters = new Array();          filters[0] = new nlobjSearchFilter('internalId', null, 'is', lineItem);          //alert("Setting search results to "