I'm inclined to agree with Ornis that they know more than we do, either way.
So either they know it's there, by whatever means (including the pings perhaps - but they certainly have more classified info that we're not party to) and they are looking in the right place, or they know it isn't there, and are looking in the wrong place for some obscure reason to do with obfuscating the truth.
More likely the first.
In which case I believe it's highly likely it will turn up there eventually. If you want to be a conspiracy theorist then that time might be once the geopolitical issues have been mostly ironed out and it's 'safe' to find it...