These are two stubs for residual paychecks from Jeffrey Voorhees who played the little boy who gets eaten on his raft (Alex Kintner). The envelope is dated August, 1975...so it is likely what held his very first paycheck. The two stubs are from royalties in later years. One is from an 80's documentary on horror films called "Terror in the Aisles" which used a clip of his attack scene.
