Read the police complaint at that link, the social security card was found in the jeep along with his drivers license and shooting range card.
Not at the link I posted. It said they were found via search warrant at his home.
“Police searched the home, where, according to the complaint, they found his Pennsylvania driver’s license, his Social Security card, his game commission range permit, camouflage face paint, flash lights, a black hooded sweatshirt, two empty rifle cases, “military gear” and “various information concerning foreign embassies.””