Question

Might the Trojans have seen anything sinister if they had looked more closely at the wooden horse?

Answer 1

Yes, because if they weren't busy  rejoicing, they would have been there to detect the Greek soilders huddled in the colossal horse.

Answer 2

Yes, they would have, because in the wooden horse was a contingent of Greek soldiers waiting to help their follow comrades outside the city get into the city of Troy to destroy it.