JavaScript Trouble filtering unique ID's

Setup: leftItems & rightItems are arrays of 5 digit ID's. matchedItems is an array of all those ID's - there a lots of results with the same ID. $matches is a div to which I want to append results ONLY IF a result with that ID has not been added to the list.

PROBLEM: I keep getting div's with the same ID in $matches! However, i know my filter does SOMETHING because if I add .toString to the existence check like this: matchedItems.indexOf(litem.toString()), I get more results. My check gets it down to 2 or 3 results w/the same ID, but not to just 1 like i want.

leftItems.forEach(function (litem) {
    rightItems.forEach(function (ritem) {
        if (litem === ritem) {
            var itemDiv = $('.results.left a[provider-id="' + litem + '"]');
            var miniMe = itemDiv.clone();

            if ( matchedItems.indexOf(litem) === -1 ){
                $matches.append(miniMe);
                matchedItems.push(litem);
            } else { 
                console.log('element exists with id: ' + litem);
            }

        }
    });
});
Answer:1

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