Hacker News Reader

First, the article states that the Bitcoins were in fact transferred to a BKA wallet.

Second, giving someone your private keys does not constitute a transfer of bitcoins. It just expands the number of people able to spend the funds, while a real transfer make the former holder unable to spend the funds.

Imagine the new holder of the private key not immediately transferring to a new address where only they have the private key.

Law enforcement is probably gonna want to avoid the chance of that wallet being backed up somewhere else and suddenly showing up empty.

According to TFA they transfered it to a wallet:

> Einer der Männer habe die Bitcoins auf ein sogenanntes Wallet – also ein Konto für die Kryptowährung – des BKA übertragen.

Google Translate:

> One of the men transferred the Bitcoins to a so-called wallet - an account for the cryptocurrency - of the BKA