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4 SE 164-81 SAFE DEPOSIT BOXES: Since nothing wags found in the search conducted by the Army in March and April, 1972 of the probable drop area in southwestern Washington, it now appears quite possible that the hijacker escaped safely and might have secreted the money in a safe deposit box. It is recommended that nation-wide circularization he made of all banks, savings and loan associations and commerical companies offering this type security. Fach such location would he furnished with a description of the subject and the artist's conception showing the hijacker with and without the glasses. THE BOEING COMPANY: In 1963-1564, The Boeing Company had a team of 20 to 30 engineers and test pilots experimenting with the air stairs of Tho Boeing 727 to datermine the plane’s adaptability for dropping cargo or personnel. In the tests conducted the air stairs were removed and packages were b7E The Boeing Company has furnished the names of their employees who were involved in that experiment and investi- gation is being conducted to determine if one of these could be the hijacker. They are also being interviewed for any info they may have as to the identity of the hijacker. Seattle is continuing to screen suspects in this matter, which are received from various sources and will give expedite attention to any worthwhile information obtained. DB Cooper-8376