Switzerland's Office of the Attorney General (OAG) said it undertook a "collection of evidence on cooperative basis" of sports rights agency Kentaro, based in the Swiss town of Wil.
"Kentaro gave the attorney general's office relevant documents as part of a collection of evidence on a cooperative basis on May 27 for our investigation," said a spokeswoman for the Berne-based authority which is leading the probe into football's global governing body.
A representative for Kentaro, which is listed in the Swiss commercial registry as having entered liquidation proceedings last year, could not be reached. Numbers listed for the firm in Wil and London were disconnected.
The seizure happened the same day Swiss authorities said they had opened criminal proceedings on suspicion of mismanagement and money laundering over the decisions to stage the 2018 and 2022 FIFA football World Cups in Russia and Qatar. That was also the day U.S. prosecutors announced charges against 14 football officials and sports business figures in a separate corruption probe.
The news was first reported by on the website of German daily Bild.
(Reporting by Katharina Bart; Karolos Grohmann in Berlin contributed reporting; Editing by Peter Graff)