Elon Musk was issued a subpoena by the US Virgin Islands in its lawsuit accusing JPMorgan Chase & Co. of knowingly benefiting from Jeffrey Epstein’s sex-trafficking.

The USVI on Monday asked the judge overseeing the case to authorize alternative means of serving the April 28 subpoena on Musk. The territory said it had reason to believe Epstein referred or attempted to refer Musk to JPMorgan.

In its filing, the USVI said it made good-faith efforts to obtain an address for Musk, including hiring private investigators, but had been unable to locate one for the billionaire. The territory said it also tried to serve Musk at the offices of Tesla Inc.

Several other billionaires, including the founder of Google, have also been subpoenaed in Epstein suits.