As it proved to be rather difficult to find the final OAS report - that was published on 4 december - on the Bolivian elections here the link. Note that unlike the preliminary report and its annexes the final report is only in Spanish and only available as pdf. Obviously they are trying to restrict the distribution of the report. The report contains 95 pages and is accompanied by 9 appendixes that contain about 400 pages in total.
To help those who want to read it I hosted a machine translated (in English) copy of the main report. Note that the first page is mostly white.
An article on FAIR is the best rebuttal of the OAS claims that I have seen thus far.