A Long Island auto shop charged taxpayers nearly $2 million for parts it may have never installed on LIRR vehicles — and no one even noticed, according to the MTA Inspector General. The suspected scam only came to light when an anonymous tipster blew the whistle, authorities said. The shop, which was not named in the IG’s report released Thursday, raked in a total of nearly $7 million in taxpayer funds from 2022 to 2024, including more than $1.6 million for fleet-vehicle parts it could not