That doesn't mean that they were engaged in combat.
Most of the 501th SS' tigers did not fight at all.
The 506th had little presence in the battle as well.
The 506th were in Heavy fightning already before the "battle of the bulge" in "Operation Queen"(German defensive victory) when they fight against US tanks at Puffendorf.King Tigers opened fire from high range against the US tanks.
http://en.wikipedia.org/wiki/Operation_Queen
Ninth Army's advance through the Rur plains
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Meanwhile in the north 2nd Armored Division also had commenced its attack on Gereonsweiler and Linnich. The advance was very steady, and already on the next day the towns Puffendorf and Immendorf were taken. This alarmed the German command and Rundstedt authorized the release of the 9th Panzer Division for a heavy armored counterattack against the two towns. Attached to this unit was the schwere Panzerabteilung 506 (506th Heavy Tank Battalion) with about 36 King Tiger tanks. At Immersdorf, the Germans were able to break into the town, but were soon repelled at close quarter fighting at dawn. The main fighting however was at Puffendorf. Since 2nd Armored Division also wanted to continue its advance towards Gereonsweiler, the division was caught in the open when about 30 German tanks approached it. In the ensuing battle, the Americans were pushed back into Puffendorf with heavy losses. Fighting continued then around the towns. German losses for this day were 11 tanks, while the 2nd Armored Division lost about 57 tanks in the fighting.