Kammala wannan jumla: Tare da Sir Henry Billingsley da Edward Fenton, a 1588 Burghley da Walsingham sun tuhumi Osborne da kulawa da kuma duba asusun kudi na tafiyar Sir Francis Drake da Sir John Norreys
a kan Mutanen Espanya a shekara ta 1589. Osborne ya ci gaba da aikinsa ga Ma'aikatar Harkokin Kasuwanci har zuwa mutuwarsa: ya rubuta wa Ubangiji Burghley a watan Disamba na 1591 yana kira ga ci gaba da fitar da kwal. Ba a ba da doka ta ƙarshe a cikin Chancery ba a cikin shari'ar da Cornelius Avenant ya fara a 1588 da Peter Osborne da Sir Rowland Hayward, a matsayin gwamnonin Kamfanin Ma'adinai da Batir, game da hannun jari a cikin wireworks a Tintern da sauran baƙin ƙarfe a Monmouthshire, Derbyshire, da kuma a Isleworth, Middlesex har zuwa Yuni 1593. A cikin 1588 kuma, Osborne, tare da Ralph Rokeby da Thomas Fanshawe, sun kafa Hukumar da za ta amince da gina ƙafafun ruwa guda huɗu a ƙarƙashin gidan injin injin da ke gadar da sterling uku ko jetties sama da Gadar London a ƙarshen kudu, don inganta wadataccen abincin masara a cikin City: an aiwatar da aikin.