Hello:
Honestly, it should have passed by now and it is quite possible that it was missed. Symptoms of an obstruction of the GI tract are vomiting, refusal of food and water, constipation, severe diarrhea, abdominal pain, fever over 103 and lethargy. You can add a couple of teaspoons of plain canned pumpkin to be used for its fiber content to move things along in his bowels (not too much...you don't want diarrhea and too little can cause constipation, but 2 or 3 teaspoons for you little guy should suffice). Providing he is acting normally at this point, I would wait and see if he develops any symptoms. Good luck and hope all goes well :)
animal care specialist
15+ yrs pet health care, breeder of English Mastiffs, barnyard, knowledgable aquarium keeper