The tender is usually deposited in a large brown envelope by the old-fashioned cab companies, allegedly.
Rarely, if ever does one lose the contracts to a competitor.
Nicely portioned out to suppliers, who insist on their drivers pay a "Christmas box" to the cab company, never knowing whether the bribe gets to the government official in Leinster house, etc, or simply trousered by the cab company owner.
I know where I'd place my bet.
Reminds me of an official in JMSE asking James Gogarty, who handed a large brown envelope to Ray Burke which was slipped into an office draw "Will we get a receipt?" "Will we f**k" was Mr. Gogarty's reply.