Was there ever a time people would trust a piece of paper in isolation? Let us look at the example of Solidarność (the first independent trade union that managed to survive in the Warsaw pact; 30% of society being members). Unlike Stasi, Polish equivalent didn't believe in fancy tech. When regime falling was imminent, they simply burned the documents, leaving no hope to glue shreds back together. Except the documents that proved that the leadership of Solidarność, including Lech Wałęsa (Nobel peace prize winner, first post-communist president) were actually moles on regular secret informant payroll.

Nobody doubts the veracity of those documents... But the question "do you believe they actually were moles?" is an infallible predictor of who did a person vote for in the last couple decades.