MOMBASA, 21 September — What began as a routine day on a busy minibus has erupted into one of Kenya’s strangest international scandals. A USB memory stick, found last Friday in a matatu (public minibus), contained an encrypted “sleeper ledger” that Kenyan investigators say records KSh 1.9 billion (about €12.5 million / $13 million) in covert payments tied to approvals for a planned Kilindini port expansion. By Monday morning the Ethics and Anti‑Corruption Commission (EACC) had frozen tens of millions of shillings in project accounts, raided offices in two coastal counties and arrested four people — and two European diplomats were summoned to the foreign ministry.
The stick was discovered on the floor of matatu route M4 by market vendor Sísí Bernis, 34, who told reporters she nearly discarded it. "I thought it was rubbish — but it was heavy, like it had secrets," she said. Ms Bernis handed it to a local repair shop; technician Ignacio Sauceda‑Chacón, 28, opened the files and found 3,200 documents, spreadsheets labelled 'operational payments' and a series of coded emails pointing to accounts at a Geneva‑based private bank called Helvetic Trust. "There were bank references, offshore company names and transfer receipts — all in one folder called ‘holiday photos’," Mr Sauceda‑Chacón said. "I knew immediately this was not ordinary. I called the EACC."
EACC director Hannah Mukiri told The Plausible Post the ledger appears to show direct payments from a Helvetic Trust client account into companies that won procurement contracts or consultancy fees connected to the Kilindini deep‑water works. "We have evidence of structured payments across 2024–26 totalling KSh 1.9 billion with little to no procurement justification," she said. The commission said four people were arrested on suspicion of corruption, money‑laundering and falsifying procurement documents: a county procurement chief, a senior executive at a local shipping firm, and two directors of shell companies. Mukiri said the EACC had frozen about KSh 1 billion (roughly €6.5 million / $6.8 million) held in project disbursement accounts pending forensic audit.
Helvetic Trust, the bank named in the files, issued a terse denial through its Zurich office, calling the ledger "unauthorised, likely manipulated and uncorroborated" and threatening legal action if the material were published further. The Swiss delegation in Nairobi said it had been in contact with Kenyan authorities and would cooperate with mutual legal‑assistance requests. The foreign ministry, however, said it had summoned two European envoys for urgent explanations after documents suggested diplomatic channels were used to expedite permits for contractors linked to the alleged payments.
The political and economic fallout has been immediate. Shares in Seaborn Infra Ltd — the Singapore‑backed firm leading the Kilindini works consortium — plunged 15% on the Nairobi Exchange on Monday, wiping roughly KSh 2.3 billion off investor value and prompting the consortium to pause onshore hiring. "Two thousand five hundred casuals were due to begin work next week; that pay stop will ruin families," said Olivier Pruvost, a logistics manager who had been recruiting staff for the port works. Local labour groups staged a noisy protest outside the county offices in Mombasa, carrying placards demanding transparency.
The discovery has also produced an extraordinary human twist: the ledger’s escape from a secure corporate network to the bottom of a matatu underlines how fragile digital secrecy can be. "We live in a world where a single misplaced stick can topple whole deals," said Ilmari Pahkasalo, a Helsinki‑based forensic accountant flown in by the EACC. Protesters at the Mombasa rally chanted for the project to be stopped. Sólbergur Hámunds, an Icelandic volunteer who has lived in the port city for eight months, said the mood was one of stunned disbelief. "People here feel exposed — like their futures were being traded in secret," he said.
Legal experts caution that the existence of files on a USB will not be enough on its own to secure convictions. The attorney‑general’s office has authorised a cross‑border forensic examination and requested documentation from Helvetic Trust through Switzerland’s financial regulator, which has opened an initial inquiry. Analysts say the reputational damage may be the longest‑lasting effect: international lenders and insurers are warning that projects tied to opaque banking channels will face tougher scrutiny, and Kenya risks a fresh wave of investor caution just as it seeks capital for infrastructure.
For the market vendor who started it all, the drama has been bewildering. "I only wanted to sell bread and matatus to stop and take people home," Sísí Bernis said, her voice trembling. "Now there are cameras and police and men in suits. I didn't mean for this to happen." Director Mukiri said the case would be prosecuted "expeditiously and transparently," adding: "No one is above the law — whether they carry cash in suitcases or files on a stick."
