Human odour plays no part in nests what so ever, it is common myth, common birds have very very little sence of smell and those that do only have it for reasons such as finding the right plant, they would not be able to smell human scents as a lot of people seem to think ,
However on the side of damage, this may be a big possibility, even though an egg looks good to the naked eye, it doesn't mean its not cracked, if you take the egg to a dark place and shine a torch through it any cracks would be apparent easily,
However the egg could have been partially sat on and a chick already developed and died due to chills, these eggs can be good in a nest as it helps to trap heat when sat on and when chicks hatch they use them to keep warm, ....as long as their are no cracks!
If the egg was thrown it was more likely thrown for a reason, are their chicks in the nest? If their are chances are the egg was thrown because it was no good, or however it could be accidental,
The risks now are high if it was placed in that it would spread bacterial problems through any eggs or chicks, so no I wouldn't put it back in now, ....