Washington (CNN) The Trump administration gave its first indication Monday of how many parents separated from their children may have already been deported: More than 460.

In a status update on the ongoing court-ordered family reunifications filed Monday, the government said 463 parents of separated children aged five and older are indicated as no longer in the US, according to their files. Though the government says the number is "under review," it implies that potentially that many parents were deported from the US without their child.

The government has maintained that any parent deported without their child had the opportunity to bring their kid with them, but willingly left without them. Attorneys and immigrant advocates have questioned whether the parents fully understood to what they were agreeing.

A federal judge has ordered all families separated by the administration at the border reunited by Thursday, provided they are not ineligible due to issues like criminal history or safety concerns.

But for the 12 already deported parents the government identified in its first batch of reunifications, families with children under the age of 5, the government missed the deadline. Tracking down those parents and reaffirming they in fact do want their child to remain in the US without them proved difficult when the parents numbered one dozen. The government has not indicated how it will track down hundreds.

Read More