AN SMT CREW VIOLATED SPECIAL USE AIRSPACE P40/R4009.

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DEPARTED HELIPORT ZZZ1 IN PA ENRTE TO ZZZ2. BECAUSE OF WX (SNOW) IN AREA; THE RTE CHOSEN WAS THRU XYZ. FLEW DIRECT TO ZZZ3; TO AVOID WX; THEN TO ZZZ4. ON THE LEG TO ZZZ2; WE FLEW DIRECTLY OVER ZZZ5 OVER ZZZ6 AND THEN CALLED ZZZ TWR JUST W OF ZZZ6 TO GET CLRNC THRU THEIR AIRSPACE. TWR REPLIED THAT WE WERE IN THE EXPANDED RESTR AREA P40/R4009. WE WERE NOT AWARE RESTR AREA HAD EXPANDED. FLT SERVICE DID NOT MENTION THIS EXTENSION DURING THE FLT BRIEF. ZZZ TWR TOLD US TO TURN NW AND TO CALL CTR AT NEXT STOP. THE NEXT DAY; THE CAPT CALLED BACK TO THE FSS TO FIND OUT ABOUT THIS RESTR AREA EXTENSION AND WAS TOLD BY THE FSS SPECIALIST THAT HE WAS UNAWARE OF THIS. HE THEN CHKED NOTIFICATION LOGS AND COULD NOT FIND ANYTHING REGARDING P40/R4009. THE UNIVERSAL FMS AND THE ARGUS 7000 CE AND VFR CHART ALL SHOWED US WELL CLR OF THIS AREA. SUPPLEMENTAL INFO FROM ACN 542014: I CALLED CTR AND SPOKE WITH A SUPVR. HE SAID WE COULD HAVE FLOWN INTO THE EXTENSION AREA. I THEN CALLED BACK TO CTR ON 3/MON/02 AND SPOKE AGAIN WITH A SPECIALIST. HE TOLD ME THAT THEY HAVE HAD BETWEEN 50-60 AIRPLANES/ACFT THAT HAVE NOT RECEIVED ANY INFO ON THE CAMP DAVID EXTENSION. WE USED ALL AVAILABLE INFO FOR THIS TRIP IE FSS; CURRENT SECTIONALS; CURRENT CHARTS; ARGUS 7000C/E MOVING MAP; FMS UWS ID. ALL OUR INSTRUMENTS; CHARTS; MAPS AND AREA MAPS SHOWED US CLR TO THE N.