I highly doubt KGB or SOROS could have access to place paper copies in 1991 on a flake like obama. Email and electronic files were not used then. More likely an US agency that had the power and know how to do it. (Something they would have access and repeated opportunity to do it. )
If he was *their* flake, they would work with what existed. Maybe a nice "honey trap" on some less than attractive clerk in the DoH?
They really do/did things that way you know. At least most of my security briefs over the past 35+ years have said they did, in some cases citing specific cases and naming names.