Lots of rumors about digs near Clark Field, but nothing substantiated that I've seen.
No one has actually been allowed to really dig, to my knowledge. In any event, it'd be extremely expensive, and the buried stuff would be badly damaged. They'd need ground radar to make sure they dug in the right place, unless they have new information. Even if they were able to find the planes and dig them up, the rest of the job, getting permission to export, followed by arranging for and paying for shipping.