items = doc.pageItems.itemByLabel("test");
var tf = app.activeDocument.textFrames.everyItem().getElements();
var oldPosition = [tf[0].geometricBounds[1].toFixed(3),tf[0].geometricBounds[0].toFixed(3)];
var newPosition = [100,100];

// moving or scaling gives a new position
tf[0].move(newPosition);
alert ("move 1");

// back to old position
tf[0].move(oldPosition);
alert ("moved to old position");