You can certainly return both bottles. I'd do what another poster suggested ie, squjirt out excess, lock down pump as it was sent to you. You could place a piece of plastic wrap over the top of it too.
Wrap them up, place in a box. Like this site & hsn, download & print a return label, slap it on your package, drop off at post office or UPS, no questions asked because you already have a prepd label on it. DONE.