Jataayu tells to Rama that Ravana abducted the Sita
"Oh, boy Rama, blest is your eternality, for whom you are searching as with the search of a rejuvenescent herb in the vast of forest, Ravana stole that lady and my lives, too... [3-67-15]
But later Lakshmana tell to Hanuman that they do not know who abducted the Sita
"He who aspires to keep up the well-being of all the beings, and he who is merited for all comforts and respectability is now devoid of his prosperity and predisposed to forest dwelling... such as he is, his wife is abducted by a guise changing demon in a lonely place, of whom we know not... we know not which demon stole his wife... [4-4-13, 14]
The only possibilities I can think are either Lakshmana did not hear the conversation between Rama and Jataayu or Lakshmana is intentionally hiding the truth.
But there is no chance for the former reason because Rama told the following words to Lakshmana
"Lakshmana, this eagle which has dashed to rescue Seetha in order to render help to me is slain by that brute-forced Ravana, only because of me, you see... [3-68-22]
And there is also a less chance for the latter reason because of the reason that Lakshmana may not speak untuth that too infront of Rama.
Then what is the actual reason (or strategy) for Lakshmana to hide the information about Ravana abducting Sita?