H.R. 10472 requires the United States Postal Service Office of Inspector General to maintain adequate staffing levels in its Office of Investigations starting in fiscal year 2027 to handle current and projected investigative workloads. The bill allows the Postal Service Inspector General to use special hiring authorities to improve recruitment and retention of special agents. Beginning one year after the bill's enactment and annually thereafter, the Inspector General must submit a report to Congress assessing investigative staffing needs, vacancy rates, caseloads, and hiring progress. The legislation also permits the Office of Investigations to enter into cooperative agreements with state and local law enforcement agencies to assist with investigations related to postal matters. This bill affects the Postal Service's internal oversight capacity and indirectly impacts mail customers by strengthening accountability mechanisms within the agency.