The “friend” of Farook purchased the long-guns and has been missing since last Wednesday?….  sketchy.

CALIFORNIA – FBI agents raided a Riverside home belonging to a friend of San Bernardino shooter Syed Rizwan Farook as they try to determine whether the man purchased two of the semiautomatic rifles used in the massacre, according to a law enforcement source.

The source, who asked to remain anonymous because the case is ongoing, said officials have been trying to talk to the man to see what he knows. It’s far from clear whether the man had anything to do with the violence or even knew what Farook did with the guns, the source added. A second source said the guns were purchased three years ago.
The person the FBI is seeking to interview is Enrique Marquez Jr., a source said.
Farook, his parents and siblings lived on Tomlinson Avenue for several years before moving out a few months ago. Marquez lived next door.
While Farook generally kept to himself, one exception was his friendship with Marquez, who shared his love of tinkering with cars, neighbors said.
On Thursday, Gustavo Ramirez, who said he was Marquez’s stepfather, told a Times reporter that he and his wife hadn’t heard from Marquez since Wednesday afternoon and were concerned. Ramirez said it was unlike Marquez not to come home.
On Friday, someone had put up a sign in the family’s yard that said: “Please keep off the property thank you.”
The garage door appeared to have been broken, and a window was shattered.