[GRADE A1 -- EFTA00060795 (DOJ corpus, legal document)]
The Last Will and Testament names Nikolic as backup executor. Nikolic's 2019 emails (13 total, all pre-arrest) include the Feb 23 exchange: "How are you? So sorry it must be annoying. Thinking of you." / Epstein: "florida. yes its been rough going."
[v4.0 -- FBI Investigation of Nikolic]
v4.0 reveals the FBI investigated Nikolic after Epstein's death:
EFTA00128842 (FBI FD-1023, Dec 2021): FBI Confidential Human Source #00070259 filed a report on Boris Nikolic in connection with Southern Trust / Southern Country International wire fraud investigation. Case ID: 272-SJ-3262541. Drafted by Herrin V. Morse, approved by Stamos Spiro J.
EFTA00128637 (FBI EC, Apr 29, 2020): "To open an investigation into the transfer of $15,000,000 by Jeffrey Epstein after his death on 8/10/2019 into his defunct SOUTHERN COUNTRY INTERNATIONAL bank..."
EFTA00308095: Confidentiality agreement between Jeffrey E. Epstein (as President of Southern Trust Company, Inc.) and Boris Nikolic -- confirming Epstein formally served as Nikolic's representative in Gates negotiations.
EFTA01106142 (Aug 8, 2013): Letter to William H. Gates: "You, William H. Gates ('Mr. Gates'), have specifically requested that the undersigned, Jeffrey Epstein ('Mr. Epstein'), personally serve as the representative of Dr. Boris Nikolic ('Dr. Nikolic') in discussions and negotiations with Mr. Gates."
Nikolic's graph footprint is almost entirely jmail-based:
This is extraordinary for someone with 1,773 emails. Zero DOJ document mentions suggests either systematic redaction of Nikolic's name from DOJ releases, or his communications were compartmented from the House Oversight/EFTA corpus. The FBI CHS report and Southern Trust investigation documents do reference Nikolic, but through FBI-internal FD-1023/EC filings rather than released documents.