Yes, I've got scans from Népsport from those days. On 9th they said about Soviet boycott, on 17th about Hungarian boycott with the release of Hungarian NOC, then on 18th the decision of Polish NOC (yes, Poland waited for Hungarian decision to announce its, but it was obvious that both will support the USSR - there was a meeting with the top athletes and the only one to protest was Janusz Peciak, he was later backed by Irena Szewińska, after the decision was taken Peciak was privately backed by Polish NOC president who told him he had to go along the political instructions). On 20th the journalists of Népsport wrote an article backing the boycott - they didn't sign it with their names.