hubieran arribado
-they/you had arrived
Past perfect subjunctive ellos/ellas/ustedes conjugation of arribar.

arribar

Algunos participantes no solo desearon que los documentos hubieran arribado a tiempo para este período de sesiones, y no –como en algunos casos– solo unos pocos días antes.
Some participants only wished the documents had all arrived in good time for this session, and not, in some cases, just days before.
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